Joel is the founder of the Photo Ark, a groundbreaking effort to document species before they disappear—and to get people to care while there’s still time.

Explore the Photo Ark

Search the 37,442-picture Photo Ark for an animal or species. Scroll down to see every species in the Ark … if you’ve got all day.

  • 11,309 species in Photo Ark as of today
    Explore the Photo Ark Search the [photoark_count]-picture Photo Ark for an animal or species.
  • 25 years to document every species in human care
  • Photo: A carmine shiner (Notropis percobromus) at the Oklahoma Aquarium in Jenks, OK.
  • Meadow fritillary (Boloria bellona) from Cross Lake, Minnesota.
  • Picture of a North American millipede (Narceus americanus) at the Audubon Insectarium in New Orleans.
  • Picture of a red-sided garter snake (Thamnophis sirtalis parietalis) at Reptile Gardens.
  • Picture of a vulnerable (IUCN) and federally threatened Southern rockhopper penguin (Eudyptes chrysocome chrysocome).
  • Photo: Wild nightcrawlers (Lumbricus terrestris) caught in Lincoln, Nebraska.
  • A portrait of a marbled cat (Pardofelis marmorata marmorata).
  • A northern spring salamander (Gyrinophilus porphyriticus) from a private collection.
  • An African reed frog (Hyperolius argus) at the Rolling Hills Wildlife Adventure in Salina, KS.
  • Picture of a vulnerable male and female Eastern hoolock gibbon (Hoolock leuconedys) at the Gibbon Conservation Center.
  • Photo: Brown-necked parrot (Poicephalus fuscicollis suhaelicus) at the Avilon Zoo.
  • Hong Kong whipping frog (Polypedates megacephalus) at the Houston Zoo.
  • Photo: Glowlight danio (Celestichthys choprae) at Zoo Negara.
  • Photo: A Yamatonuma shrimp (Caridina japonica) at Aquarium Berlin.
  • A four-toed salamander (Hemidactylium scutatum) at the Toledo Zoo, Toledo, Ohio.
  • A caterpillar, probably of a noctuid moth, from the Mount Gorongosa Range during the Bioblitz in Gorongosa National Park.
  • Photo: Southern hawker (Aeshna cyanea) at Alpenzoo in Innsbruck, Austria.
  • Picture of a common goldeneye (Bucephala clangula) at Sylvan Heights Bird Park.
  • A vulnerable spectacled bear (Tremarctos ornatus) named Billy at Parque Jaime Duque near Bogota, Colombia.
  • Photo: Damaraland mole rats (Fukomys damarensis) at the Houston Zoo. These burrowing rodents from sub-Saharan Africa are one of only two known eusocial mammals.
  • Picture of a mantis shrimp (Odontodactylus scyllarus) at the Monterey Bay Aquarium.
  • Photo: A pair of sister, six-month-old, Andean white-eared opossums (Didelphis pernigra) at Zoologico de Quito.
  • A female greater green leafbird (Chloropsis sonnerati) at the Sedgwick County Zoo.
  • Picture of a greater mouse deer, greater Malay chevrotain or napu (Tragulus napu) at the Topeka Zoo.
  • Picture of an orange spotted filefish (Oxymonacanthus longirostris) at Omaha's Henry Doorly Zoo and Aquarium.
  • Picture of a Burton's legless lizard (Lialis burtonis) at the Cheyenne Mountain Zoo in Colorado Springs, CO.
  • Photo: Abert's squirrel or tassel-eared squirrel (Sciurus aberti) at Liberty Wildlife.
  • Photo: Knobby brain coral (Pseudodiploria clivosa) at Mote Tropical Research Laboratory.
  • A West African dwarf crocodile (Osteolaemus tetraspis tetraspis) at the Lincoln Children's Zoo. This species is federally endangered and listed as vulnerable on IUCN.
  • Picture of a black vulture (Coragyps atratus) at Sylvan Heights Waterfowl Park.
  • Photo: Longnose dace (Rhinichthys cataractae) at the Albuquerque BioPark Aquarium.
  • Photo: A green spotted puffer (Tetraodon nigroviridis) at the Singapore Zoo's River Safari area.
  • A critically endangered Celebes crested macaque, Macaca nigra.
  • Photo: A male comb duck (Sarkidiornis melanotos sylvicola) at the National Aviary of Colombia (Aviario Nacional de Colombia).
  • An Amazonian brown brocket deer (Mazama nemorivaga) at Parque Jaime Duque.
  • Photo: A critically endangered female cichlid (Pseudotropheus saulosi) from a private collection.
  • A red-crested cardinal (Paroaria coronata) at the Omaha Henry Doorly Zoo, in Omaha, Nebraska.
  • A tammar wallaby (Macropus eugenii) at the Lincoln Children's Zoo.
  • Photo: Chromidotilapia melaniae at L'aquarium tropical du palais de la Porte DorŽe.
  • Photo: A dusky-legged guan (Penelope obscura bronzina) at BioParque do Rio.
  • Photo: A Wessel tiger ornamental tarantula (Poecilotheria tigrinawesseli) at Museum of Nature South Tyrol.
  • Photo: A WoodworthÕs frog (Limnonectes woodworthi) at the University of the Philippines.
  • An endangered (IUCN) and federally endangered chimpanzee (Pan troglodytes) at Rolling Hills Wildlife Adventure near Salina, KS.
  • Photo: Federally endangered Short's goldenrod (Solidago shortii), at the Missouri Botanical Garden.
  • A moluccan imperial pigeon (Ducula perspicillata perspicillata) at the Houston Zoo.
  • Photo: Possibly a baby robin, from the home of wildlife rescuer in Lincoln, Nebraska.
  • A Kenyan Sand Boa (Eryx colubrinus loveridgei) at Sedgwick County Zoo.
  • Photo: Epaulette shark (Hemiscyllium ocellatum) at the Dallas Children's Aquarium.
  • A Guam rail (Hypotaenidi owstoni) at the Sedgwick County Zoo, Wichita, Kansas. Though reintroduction efforts are underway, this species is considered extinct in the wild (IUCN) and federally endangered.
  • An aboreal alligator lizard (Abronia graminea) at the San Antonio Zoo. (IUCN: Endangered)
  • Photo: A big-headed turtle (Platysternon megacephalum shiui) from Asia at the Sedgwick County Zoo.
  • A Senegal parrot (Poicephalus senegalus) at the Sutton Avian Research Center.
  • A Malaysian river toad (Phrynoidis aspera) from a private collection.
  • Photo: A Barbary lion (Panthera leo leo) at the Plzen Zoo in the Czech Republic.
  • Photo: Left handed whelk (Busycon contrarium) from Gulf Specimen Marine Laboratories.
  • A kinkajou (Potos flavus megalotus) named Maya at Zoo Atlanta.
  • Photo: A water frog (Telmatobius sp.) at Balsa de los Sapos.
  • Photo: An Asian black bear (Ursus thibetanus) at Kamla Nehru Zoological Garden.
  • Picture of a giant cave gecko (Pseudothecadactylus lindneri) at Wild Life Sydney Zoo.
  • Picture of a Spotted jelly (Mastigias papua) at Omaha's Henry Doorly Zoo and Aquarium.
  • A vulnerable grey-headed flying fox (Pteropus poliocephalus) at the Australian Bat Clinic. Bats act as pollinators and seed dispensers, however bats are in serious decline around Australia largely due to entanglement in fruit tree netting.
  • Picture of a Vicente's poison frog (Oophaga vicentei) at the Panama Amphibian Rescue and Conservation Project.
  • A black spotted newt (Notophthalmus meridionalis) at the San Antonio Zoo. (IUCN: Endangered)
  • An endangered Speke's gazelle (Gazella spekei) at the Indianapolis Zoo.
  • Chiapas beaded lizard (Heloderma horridum alvarezi) at Zoo Atlanta.
  • Photo: A ranger marsupial frog (Gastrotheca orophylax) at Centro Jambatu in Quito, Ecuador.
  • Photo: Golden silk orb weaver spider (Nephila edulis) at the Budapest Zoo.
  • Picture of a male dusky Canada goose, Branta canadensis occidentalis, at Sylvan Heights Bird Park.
  • Picture of an eastern blue-tongued skink (Tiliqua scincoides scincoides) at the Lincoln Children's Zoo.
  • Photo: Red-spotted newt (Notophtalmus viridescens), in a juvenile or 'eft' stage, at Zoo Atlanta.
  • Photo: A red diamond rattlesnake (Crotalus ruber) at Reptile Gardens.
  • Photo: Grey gecko (Woodworthia maculatus) at the Wellington Zoo.
  • Photo: Amazon pink toe tarantula (Avicularia amazonica) at the Loveland Living Planet Aquarium in Draper, UT.
  • Photo: A western worm snake (Carphophis vermis) from a private collection.
  • Photo: A Fiji Island banded iguana (Brachylophus fasciatus) at Omaha's Henry Doorly Zoo.
  • Picture of a bighead searobin (Prionotus tribulus) at Gulf Specimen Marine Lab and Aquarium.
  • Arctic ground squirrel (Spermophilus parryii) at the University of Alaska at Fairbanks.
  • Photo: A flavescent peacock cichlid (Aulonocara stuartgranti) at the Institute of Marine Mammal Studies (IMMS) at Gulfport, MS. This animal is part of their public education area.
  • Photo: A male, Pastaza marsupial frog (Gastrotheca longipes) at Balsa de los Sapos.
  • Picture of two vulnerable (IUCN) and federally endangered Cabot's tragopan (Tragopan caboti) at Pheasant Heaven, a private pheasant breeding facility near Clinton, NC.
  • Photo: Metallic starlings (Aplonis metallica) at the San Antonio Zoo
  • Photo: Banded horned treefrog (Hemiphractus fasciatus) at El Valle Amphibian Center.
  • A vulnerable (IUCN) and federally endangered clouded leopard (Neofelis nebulosa) at Houston Zoo.
  • A black and white ruffed lemur (Varecia variegata) at the Cheyenne Mountain Zoo, Colorado Springs, Colorado. (IUCN: Critically Endangered)
  • A emperor tamarin (Saguinus imperator imperator) at the Dallas World Aquarium.
  • Photo: A chaffinch (Fringilla coelebs gengleri) at Hessilhead Wildlife Rescue.
  • A desert rosy boa (Lichanura trivirgata gracia) at the Miller Park Zoo in Bloomington, Illinois.
  • Photo: Hardhead sea catfish (Arius felis) at Gulf Specimen Marine Lab and Aquarium.
  • Picture of a common garden snail (Helix aspersa) at Healesville Sanctuary.
  • Picture of a North African hedgehog (Atelerix algirus) at the Virginia Aquarium.
  • Picture of an apostlebird (Struthidea cinerea) at Healesville Sanctuary.
  • Photo: Asian grass lizard (Takydromus sexlineatus) from a private collection.
  • Photo: Colombian pumpkin patch tarantula (Hapalopus sp.) at Butterfly Pavilion in Westminster, Colorado.
  • The eye of a pied mossy frog (Theloderma corticale) at the Houston Zoo.
  • A Western harvest mouse, Reithrodontomys megalotis.
  • A pallid bat (Antrozous pallidus) at the North Carolina Zoo, Asheboro, North Carolina.
  • Photo: East African spring hare (Pedetes surdaster) at the Plzen Zoo in the Czech Republic.
  • A speckled cape tortoise/padloper (Homopus signatus signatus) at the St. Louis Zoo.
  • An endangered (IUCN) and federally endangered giant otter (Pteronura brasiliensis) at the Dallas World Aquarium.
  • Photo: Spanish deer or red deer (Cervus elaphus hispanicus) at the Madrid Zoo.
  • Photo: Southwestern bobcat (Lynx rufus baileyi) at Southwest Wildlife Conservation Center.
  • Photo: A sea pork (Aplidium stellatum) at Gulf Specimen in Panacea, Florida.
  • A Viceroy butterfly (Limenitis archippus) at the Lincoln Children's Zoo in Lincoln, Nebraska.
  • Photo: A true burrowing frog (Glyphoglossus molossus) at Angkor Centre for Conservation of Biodiversity (ACCB) in Cambodia.
  • A vulnerable (IUCN) and federally endangered California tiger salamander (Ambystoma californiense) at the Fresno Cahffee Zoo, Fresno, California.
  • Picture of small hooded katydids (Phyllophorella queenslandica) at the Wild Life Sydney Zoo.
  • Photo: Splash-back poison frog (Ranitomeya variabilis) at the Houston Zoo.
  • A juvenile red rat snake (Elaphe guttata) at the Archbold Biological Station.
  • A Florida cooter (Pseudemys floridana) at the Chapultepec Zoo in Mexico City.
  • Photo: A mushroom coral (Fungia fungites) at Semirara Marine Hatchery Laboratory in the Philippines.
  • Photo: A red billed parrot (Pionus sordidus) at Zoologico de Quito.
  • Bornean eared frog (polypedates otilophus) at the National Aquarium in Baltimore.
  • Photo: A DumerilÕs wrinkled ground frog (Platymantis dorsalis) at the University of the Philippines.
  • Picture of a crab-eating fox (Cerdocyon thous) named Pepito at the Summit Municipal Park in Gamboa, Panama.
  • A four-toed salamander (Hemidactylium scutatum) at the Toledo Zoo, Toledo, Ohio.
  • Photo: Crab trap worm (Lysarete brasiliensis) from Gulf Specimen Marine Laboratories.
  • Photo: Dickcissel (Spiza americana) wild caught by biologists using a mist net, near Wood River, Nebraska.
  • Picture of a basket star (Astrophyton muricatum) at Pure Aquariums from the Gulf Specimen Marine Lab.
  • Photo: The Magdalena River turtle or Rio Magdalena river turtle (Podocnemis lewyana) at Cafam Zoo in Melgar, Colombia.
  • A marginated tortoise (Testudo marginata) at the Gladys Porter Zoo.
  • Photo: Blue color phase of the red swamp crayfish (Procambarus clarkii) at the Insectarium in New Orleans.
  • European white stork (Ciconia ciconia ciconia) at the Lincoln Children's Zoo.
  • A blotched or banded tiger salamander (Ambystoma mavortium melanostictum) at the National Mississippi River Museum and Aquarium, Dubuque, Iowa.
  • Photo: A common bronzewing (Phaps chalcoptera) at Zoo Plzeň.
  • Photo: A big-eyed toad bug (Gelastocoris oculatus) at the Pontotoc Ridge Preserve near Connerville, OK.
  • Picture of a garibaldi fish (Hypsypops rubicundus) at the REEF, at the University of California, Santa Barbara.
  • Picture of a female greylag goose, Anser anser, at Sylvan Heights Bird Park.
  • Picture of an Eastern long-nose viper, (Vipera ammodytes meridionalis) from Syrose, Greece, at the St. Louis Zoo.
  • Photo: Bottlebrush crayfish, Barbicambarus cornutus, at the Crayfish lab in West Liberty University in West Liberty, WV. This specimen is from Baron Creek, TN.
  • Photo: Trinidad dwarf tiger (Cyriocosmus elegans) at the Moscow Zoo.
  • A stonecat (Noturus flavus) at Gavins Point National Fish Hatchery and Aquarium.
  • A black spine-neck swamp turtle (Acanthochelys spixii) in a private collection in Houston, Texas.
  • Borneo eared frog (Polypedates otilophus) at the National Aquarium in Baltimore.
  • A Brazilian rainbow boa (Epicrates c. cenchria) at the Kansas City Zoo.
  • Photo: A grey forest wallaby (Dorcopsis luctuosa) at Taman Safari.
  • Photo: Bee assassin (Apiomerus spissipes) at Cedar Point Biological Station.
  • Picture of a male and female white-winged duck, Asarcornis scutulata, at Sylvan Heights Bird Park.
  • Photo: An eastern leopard tortoise (Stigmochelys pardalis babcocki) at the Caldwell Zoo in Tyler, Texas.
  • Picture of a Barrow's goldeneye (Bucephala islandica) at the Sylvan Heights Bird Park.
  • An Osage copperhead (Agkistrodon contortrix phaeogaster) at Reptile Gardens.
  • A white-eyed vireo (Vireo griseus) at Fort Hood, Texas.
  • A striped possum (Dactylopsila trivirgata) at Omaha's Henry Doorly Zoo.
  • Photo: A common blackbird (Turdus merula merula) at Hessilhead Wildlife Rescue.
  • Photo: Grey gull (Leucophaeus modestus) at the Sedgwick County Zoo.
  • Photo: A Japanese thrush (Turdus cardis) at Zoo Plzeň.
  • Photo: Smooth-fronted caiman (Paleosuchus trigonatus) at the St. Augustine Alligator Farm.
  • Photo: A blue butterfly moor, a fancy breed of goldfish at Ocean Park in Hong Kong.
  • Picture of a male and female smew (Mergellus albellus) at Sylvan Heights Bird Park.
  • A South American great horned owl (Bubo virginianus nacurutu) at Parque Jaime Duque near Bogota, Colombia.
  • A critically endangered (IUCN) and federally endangered juvenile addax (Addax nasomaculatus) at the Buffalo Zoo.
  • Photo: Northern monkshood (Aconitum noveboracense), a plant native to eastern Iowa and in nearby states.
  • A coyote (Canis latrans) at the Great Plains Zoo.
  • Picture of a rainbow sea star (Orthasterias koehleri) at the Minnesota Zoo.
  • Picture of a red-legged seriema (Cariama cristata) at the Kansas City Zoo.
  • Picture of a Heck's grass finch (Poephila acuticauda hecki) from a private collection.
  • A mudskipper (Periophthalmus sp.) on Bioko Island, Equatorial Guinea.
  • An endangered Malagasy giant jumping rat (Hypogeomys antimena).
  • Photo: Carmen, an Araucana chicken/American chicken.
  • Photo: Eurasian water shrew (Neomys fodien) at the Moscow Zoo.
  • Partula snails (Partula nodosa) at the St. Louis Zoo's Monsanto Insectarium. Once found in French Polynesia, this species is now extinct in the wild.
  • A red shiner (Cyprinella lutrensis).
  • Photo: Cactus parakeet, Eupsittula cactorum, at Loro Parque Fundacion.
  • An old world harvest mouse (Micromys minutus) at the Omaha Zoo.
  • Photo: Lined topminnows (Fundulus lineolatus) from a private collection in Knoxville, Tennessee.
  • Picture of a red-tailed hawk (Buteo jamaicensis borealis) at the Virginia Aquarium.
  • Photo: Yellow-spotted tropical night lizard (Lepidophyma flavimaculatum) from a private collection.
  • Photo: An endangered Nosy Be cichlid (Ptychochromis oligacanthus) at L'aquarium tropical du palais de la Porte DorŽe.
  • Photo: Western long-nosed snake (Rhinocheilus lecontei), claris (clear) phase, at the Arizona-Sonora Desert Museum.
  • A federally threatened Cuban iguana (Cyclura nubila nubila) at the San Diego Zoo.
  • Picture of a vulnerable (IUCN) and federally endangered Southern Africa King cheetah (Acinonyx jubatus jubatus) named George at Zoo Miami.
  • A common yellowthroat (Geothlypis trichas) at the Kissimmee Prairie Preserve State Park in Okeechobee, Florida.
  • Photo: A male jumping-spider (Habronattus brunneus) at the University of Florida in Gainesville.
  • Malaysian horned leaf frog (Megophrys nasuta) from a private collection.
  • Photo: Savage's thin-toed frog (Leptodactylus savagei) at the El Valle Amphibian Conservation Center (EVACC).
  • An endangered (IUCN) and federally endangered aquatic box turtle (Terrapene coahuila) hatchling at the Gladys Porter Zoo in Brownsville, Texas.
  • Photo: A Javan woolly-necked stork (Ciconia episcopus neglectus) at Taman Mini Indonesia Indah.
  • Picture of an Eastern water dragon (Physignathus lesueurii lesueurii) at the Wild Life Sydney Zoo.
  • Photo: A critically endangered European mink (Mustela lutreola) at the Madrid Zoo.
  • Photo: A Tsachila croaking frog (Scinax tsachila) at Centro Jambatu in Quito, Ecuador.
  • Picture of a Palawan leopard cat (Prionailurus bengalensis heaneyi) at the Plzen Zoo in the Czech Republic.
  • Photo: A critically endangered hawksbill sea turtle (Eretmochelys imbricata bissa) at Semirara Marine Hatchery Laboratory in the Philippines.
  • Photo: A cattle egret (Bubulcus ibis ibis) named DeeDee at Rogers Wildlife Rehabilitation in Hutchins, TX.
  • A Schneider's skink (Eumeces schneideri schneideri) at the Lowry Park Zoo, Tampa, Florida.
  • An endangered Malayan tiger, Panthera tigris jacksoni, at the Omaha Zoo.
  • Picture of a blue-banded toucanet (Aulacorhynchus coeruleicinctis) at the Dallas World Aquarium.
  • Photo: Josephine's lorikeet (Charmosyna josefinae) photographed at Loro Parque Fundacion.
  • Photo: Pale milk snake (Lampropeltis triangulum multistriata) collected in the Nebraska Sandhills--Thomas County.
  • Studio portrait of a red knot (Calidris canutus). The species is a candidate for listing under the Endangered Species Act due to a rapid decline in population. It is on one food during it's northward migration: horseshoe crab eggs. Overfishing of the crabs has led a dramatic the decline of both knots and crabs.
  • Photo: A Panther Gecko, Paroedura picta, from a private collection.
  • Photo: An endangered gray gibbon (Hylobates muelleri muelleri) at the Miller Park Zoo.
  • Photo: BauerÕs chameleon gecko (Eurydactylodes agricolae) at the Plzen Zoo in the Czech Republic.
  • Photo: The Western Meadowhawk (Sympetrum occidentale) at Cedar Point Biological Station.
  • Photo: Mauritanian scorpion (Androctonus mauritanicus) at the Moscow Zoo.
  • Photo: A northern water snake (Nerodia sipedon) from a private collection.
  • Photo: A chauga crayfish (Cambarus chaugaensis) at the West Liberty University Crayfish Conservation Lab in West Liberty, West Virginia.
  • Picture of the back end of a critically endangered (IUCN) and federally endangered Eastern black rhino (Diceros bicornis michaeli) at the Oklahoma City Zoo.
  • Photo: Sonoyta mud turtle (Kinosternon sonoriense longifemoralis) at the Arizona-Sonora Desert Museum.
  • A black flying fox (Pteropus alecto) at the Australian Bat Clinic. Bats act as pollinators and seed dispensers, however bats are in serious decline around Australia largely due to entanglement in fruit tree netting.
  • Photo: A pair of rescued baby Indochinese silver langurs (Trachypithecus germaini) at the Angkor Centre for Conservation of Biodiversity (ACCB) in Siem Reap, Cambodia.
  • Picture of Rhesus monkeys (Macaca mulatta) at the Rolling Hills Zoo.
  • A black rat (Rattus rattus) near Petrie, Queensland.
  • Photo: A northern water snake (Nerodia sipedon) from a private collection.
  • Baja California rattlesnake (Crotalus enyo) a Mexican species found on the Baja Peninsula at the Arizona-Sonora Desert Museum.
  • Picture of a pair of fulvous whistling ducks (Dendrocygna bicolor) at The Living Desert in Palm Desert, California.
  • Photo: A purple-margined ground beetle (Pasimachus sp.) at the Audubon Insectarium, part of the Audubon Nature Institute.
  • Photo: A female Sumba hornbill (Rhyticeros everetti) at Bali Bird Park in Bali, Indonesia.
  • Picture of a vulnerable gray bamboo lemur (Hapalemur griseus griseus) named Li'l Bit at the Cincinnati Zoo.
  • Photo: A Spix’s horned treefrog (Hemiphractus scutatus) at Balsa de los Sapos.
  • Photo: A blunt face shiner (Cyprinella camura) at the Oklahoma City Zoo.
  • A bumblebee dart frog (Dendrobates leucomelas) at the Omaha Zoo.
  • Photo: An English sparrow (also known as a house sparrow). This animal flew into a window of a building, a very common cause of injury and death to wild birds.
  • Photo: BocourtÕs arboreal alligator lizard (Abronia vasconcelosii) at Urban Ark Conservation
  • Photo: Pinecone fish (Monocentris japonica) at the Dallas Children's Aquarium.
  • A young western gray squirrel (Sciurus griseus) at Wildlife Images, an animal rehabilitation center near Merlin, Oregon.
  • Photo: A timber rattlesnake (Crotalus horridus horridus) at Reptile Gardens.
  • Picture of a western whiptail (Aspidoscelis tigris) at Springs Preserve.
  • Picture of a greater mouse deer, greater Malay chevrotain or napu (Tragulus napu) at the Topeka Zoo.
  • Picture of a black vulture (Coragyps atratus) at Sylvan Heights Waterfowl Park.
  • Photo: A juvenile Philippine forest skink (Parvoscincus sp.) at the University of the Philippines.
  • Picture of a Halmahera python (Morelia tracyae) at the Oklahoma City Zoo.
  • Picture of a Mexican kingsnake (Lampropeltis mexicana mexicana) at the Knoxville Zoo.
  • Picture of a blue phase of the strawberry poison dart frog (Oophaga (Dendrobates) pumilio) at the National Aquarium in Baltimore.
  • Picture of a western spotted skunk (Spilogale gracilis) at Utah's Hogle Zoo in Salt Lake City, Utah.
  • Photo: A lizard (Calotes sp. nov) at the Angkor Centre for Conservation of Biodiversity (ACCB) in Siem Reap, Cambodia.
  • Everglades ratsnake (Elaphe obsoleta rossalleni) at the Omaha Zoo.
  • Picture of a Sonoran spotted whiptail lizard (Aspidoscelis sonorae) at Omaha's Henry Doorly Zoo.
  • Photo: Brown necked parrots (Poicephalus fuscicollis fuscicollis) at Loro Parque Fundacion.
  • A critically endangered Geoffroy's spider monkey (Ateles geoffroyi geoffroyi) at the Chattanooga Zoo.
  • Photo: A scarlet lily beetle (Lilioceris lilii) at the Biodiversity Hall of Natural History and Science Museum.
  • Picture of an endangered fishing cat (Prionailurus viverrinus) at the Point Defiance Zoo.
  • A satanic leaf-tailed gecko (Uroplatus phantasticus) at the Houston Zoo, Houston, Texas. (IUCN: Vulnerable)
  • A giant hispanolian anole (Anolis ricordi) at the Omaha Zoo.
  • A Rio Madeira poison frog (Adelphobates quinquevittatus) from a private collection.
  • Photo: Black-necked garter snake (Thamnophis cyrtopsis) at the Phoenix Zoo.
  • Picture of a chestnut breasted munia (Lonchura castaneothorax) at the Healesville Sanctuary.
  • Photo: Pupae of Argema mimosae at the San Antonio Zoo.
  • Picture of pink-eared ducks, Malacorhynchus membranaceus, at Sylvan Heights Bird Park.
  • Photo: Atlantic canary (Serinus canaria) in Santa Cruz, Tenerife, Spain.
  • Mallard (Anas platyrhynchos) ducklings.
  • Photo: A male central greenside darter (Etheostoma blennioides pholidotum) collected from Big Darby Creek near Circleville, OH.
  • Photo: A yellow mud turtle, (Kinosternon flavescens) at the Sedgwick County Zoo.
  • Picture of a lesser Bornean crested fireback pheasant (Lophura ignita ignita) at the Houston Zoo.
  • Photo: Chilean round ray (Urotrygon chilensis) photographed at Downtown Aquarium in Denver, Colorado.
  • Photo: Lowland blotched blue tongue skink (Tiliqua nigrolutea) from a private collection.
  • Photo: Pacific lamprey (Entosphenus tridentatus) at the MK Nature Center in Boise, Idaho.
  • A federally threatened Cuban iguana (Cyclura nubila nubila) at the San Diego Zoo.
  • Photo: A Peruvian pelican (Pelecanus thagus) at the Jurong Bird Park.
  • Photo: A Mexican bluewing (Myscelia ethusa pattenia) at the Butterfly Pavilion.
  • A vulnerable (IUCN) and federally endangered California tiger salamander (Ambystoma californiense) at the Fresno Cahffee Zoo, Fresno, California.
  • Picture of a ring-billed gull (Larus delawarensis) at the Wildlife Rehabilitation Center of Northern Utah.
  • Solomon Islands ground skink (Eugongylus albofasciolatus) at the Detroit Zoo.
  • Photo: Cinnabar moth (Tyria jacobaeae) at the Trinity Western University.
  • Picture of a male pompadour cotinga (Xipholena punicea) at the Houston Zoo.
  • Photo: Bagrus filamentosus at L'aquarium tropical du palais de la Porte DorŽe.
  • Red-winged parrot (Aprosmictus erythropterus) at Parrots in Paradise, a bird attraction in Glass House Mountains, Queensland.
  • Photo: A sand rat (Psammomys obesus) at the Plzen Zoo.
  • Photo: A golden hamster (Mesocricetus auratus) at the Plzen Zoo in the Czech Republic.
  • Photo: Silverspotted sculpin (Blepsias cirrhosus) at the Alaska SeaLife Center in Seward, AK.
  • Photo: South Morocco spur thighed tortoise (Testudo graeca soussensis) at the Plzen Zoo in the Czech Republic.
  • Photo: Philippine cockatoo (Cacatua haematuropygia) from Le Parc des Oiseaux in Villars Les Dombes, France.
  • Photo: A central bright-eyed frog (Boophis rappiodes) from the Plzen Zoo in the Czech Republic.
  • Photo: Curly hair tarantula (Brachypelma albopilosum) at the Topeka Zoo.
  • Picture of a male white-winged duck, Asarcornis scutulata, at Sylvan Heights Bird Park.
  • A star finch (Neochmia ruficauda clarescens) at Plzen Zoo in the Czech Republic.
  • Picture of a four-horned chameleon (Chamaeleo quadricornis quadricornis) at the Saint Louis Zoo.
  • Photo: A male redline darter (Etheostoma rufilineatum) photographed at the Alabama Aquatic Biodiversity Center in Marion, AL. This fish was collected from Butler Creek, Lauderdale County, AL.
  • Photo: A big-headed turtle (Platysternon megacephalum shiui) from Asia at the Sedgwick County Zoo.
  • A vulnerable robber frog (Pristimantis calcarulatus) near Mindo, Ecuador.
  • Photo: Brown tawny rajah, Charaxes distanti, at Zoo Negara.
  • Photo: A critically endangered negros bleeding-heart pigeon, Gallicolumba keayi, at theTalarak Foundation.
  • A five-lined skink (Eumeces fasciatus) collected from the Conasauga River.
  • Picture of an endangered New Zealand kaka (Nestor meridionalis septentrionalis) at the Wellington Zoo.
  • Photo: A western slender glass lizard (Ophisaurus attenuatus) at the Sunset Zoo in Manhattan, Kansas.
  • Photo: Beech marten (Martes foina) at the Moscow Zoo.
  • Picture of a male ashy-headed goose, Chloephaga poliocephala, at Sylvan Heights Bird Park.
  • Picture of a vulnerable grand skink (Oligosoma grande) at the Wellington Zoo.
  • Photo: Two zebra-raccoon killifish (Aphanius fasciatus) at Aquarium Berlin.
  • Photo: California newt (Taricha torosa) at the National Mississippi River Museum and Aquarium in Dubuque, IA.
  • Sara, the endangered (IUCN) and federally endangered whooping crane (Grus americana), at the Audubon Center for Research of Endangered Species. This is an educational bird.
  • A small milkweed bug (Lygaeus kalmii).
  • A Texas horned lizard (Phrynosoma cornutum) at the Fort Worth Zoo.
  • Picture of a Great Lakes bush viper (Atheris nitschei) at the Dallas Zoo.
  • A black-chinned hummingbird (Archilochus alexandri) at the Brown Ranch, Texas.
  • A red Amazonicus poison frog (Ranitomeya amazonica) from a private collection.
  • Photo: A chestnut-bellied seed finch (Sporophila angolensis torrida) at Cetas-Ibama in Brazil, a wildlife rehab center in Manaus, Brazil.
  • Picture of a vulnerable (IUCN) and federally threatened Florida scrub jay (Aphelocoma coerulescens).
  • Photo: A King brown snake (Pseudechis australis) at Omaha's Henry Doorly Zoo.
  • Photo: Oriental fire-bellied toad (Bombina orientalis) at the Denver Zoo.
  • Photo: A female South Caucasus pheasant (Phasianus colchicus colchicus) at a private collection.
  • Picture of a diablito, also known as a little devil poison frog (Oophaga sylvatica) Alto Tambo, Ecuador locality, from a private collection.
  • Photo: A HillisÕs dwarf salamander (Eurycea hillisi) at the Auburn University Natural History Museum.
  • Photo: Woodland dormouse (Graphiurus murinus) at the Budapest Zoo.
  • A gopher tortoise (Gopherus polyphemus) a vulnerable (IUCN) and federally threatened species at Zoo Atlanta.
  • Photo: West African giant land snail (Archachatina ventricosa) at the Toronto Zoo.
  • A compton tortoiseshell butterfly (Nymphalis vaualbum) from Cross Lake, Minnesota.
  • Picture of an ocellated turkey (Meleagris ocellata) at the Dallas World Aquarium.
  • Photo: Niceforo's marsupial frog (Gastrotheca nicefori) at the El Valle Amphibian Conservation Center (EVACC). This marsupial frog raises young in a pouch on its back and is from the Darien area of Panama.
  • Photo: A Peru mushroom tongue salamander (Bolitoglossa peruviana) at Centro Jambatu in Quito, Ecuador.
  • Photo: A maroon fronted parrot, Rhynchopsitta terrisi, at Loro Parque Fundacion.
  • Photo: Checkered keelback or Asiatic water snake (Xenochrophis piscator) at Kamla Nehru Zoological Garden, Ahmedabad, India.
  • Picture of a spectacled flying fox (Pteropus conspicillatus) at the Lubee Bat Conservancy in Gainesville, Florida. Her name is Curry and she's the only one of her species captive in the western hemisphere.
  • Photo: Siamese crocodile (Crocodylus siamensis) at the St. Augustine Alligator Farm Zoological Park in St. Augustine, Florida.
  • A red phased Eastern screech owl (Megascops asio floridanus) at the Audubon Center for Birds of Prey.
  • A diamondback water snake (Nerodia rhombifer rhombifer) at the Tulsa Zoo.
  • Photo: A diving lizard or mophead iguana (Uranoscodon superciliosus) in the wild in Manaus, Brazil.
  • Picture of a yellow-bellied glider (Petaurus australis) named Shy at the Taronga Zoo in Sydney, Australia.
  • Photo: A Von der Decken's sifaka at Lemuria Land.
  • A thirteen-lined ground squirrel (Ictidomys tridecemlineatus) at the Milford Nature Center.
  • Critically endangered (IUCN) lemur leaf frogs (Hylomantis lemur), from the Panama, population, at Zoo Atlanta. This male and female frog are in amplexus, a state in which the male latches onto the female prior to egg laying and fertilization.
  • A federally threatened Northern spotted owl (Strix occidentalis caurina) named Opal.
  • An ashy gecko (Sphaerodactylus elegans) from a private collection.
  • Picture of Zestos skippers (Epargyreus zestos) at the McGuire Center for Lepidoptera and Biodiversity.
  • Photo: A pair of Harlequin quail (Coturnix delegorguei) at Safari Park Dvur Kralove.
  • Photo: An antimena chameleon, Furcifer antimena, from a private collection.
  • Picture of a Savu Island python (Liasis mackloti savuensis) at the Detroit Zoo.
  • Picture of a red-tailed boa constrictor (Boa constrictor constrictor) at the Lincoln Children's Zoo.
  • A Sandhill crane (Grus canadensis) at the Sutton Avian Research Center.
  • Photo: Green-thighed parrot (Pionites leucogaster) at Loro Parque Fundacion.
  • Photo: A dusky bush-hen (Amaurornis olivacea) on Semirara Island, in the Philippines.
  • Photo: Warmouth (Lepomis gulosus) at Welaka National Fish Hatchery Aquarium.
  • Photo: Spanish deer or red deer (Cervus elaphus hispanicus) at the Madrid Zoo.
  • Photo: Blue cheeked amazon, Amazona dufresniana, at Loro Parque Fundacion.
  • Photo: A southern bald eagle (Haliaeetus leucocephalus leucocephalus) at Sia, the Comanche Nation Ethno-Ornithological Initiative.
  • Portrait of a bobolink (Dolichonyx oryzivorus), caught for banding in grasslands along the Platte River near Wood River, Nebraska.
  • Photo: A Cuban tree frog (Osteopilus septenrionalis) at Fish and Stuff pet store in Yankton.
  • Picture of a five-month-old, endangered Tasmanian devil (Sarcophilus harrisii) joey named 'Mulana' at Healesville Sanctuary. Its name means 'spirit' in the Aboriginal language.
  • Photo: Critically endangered Murray cod (Maccullochella peelii) at the Freshwater Ecology and Marine Biology Dept. at Templestowe College.
  • Desert pupfish (Cyprinodon macularius), a federally endangered fish at the North Carolina Zoo.
  • A studio portrait of a vulnerable (IUCN) male lesser prairie-chicken (Tympanuchus pallidicinctus) that was caught to be radio collared.
  • A Sandhill crane (Grus canadensis) at the Sutton Avian Research Center.
  • Photo: A white-naped jacobin hummingbird (Florisuga mellivora) from the wild in Gamboa, Panama.
  • A female eastern forktail damselfly (Ischnura verticalis) at Spring Creek Prairie Audubon Center near Denton, NE.
  • Photo: A scrawled cowfish (Lactophrys tricornis) at Gulf Specimen Marine Lab and Aquarium.
  • Von der Decken's hornbill (Tockus deckeni) at Tampa's Lowry Park Zoo. The male has an orange beak, while the female has a black beak.
  • A female Edward's pheasant (Lophura edwardsi) at the Jurong Bird Park. Formerly: Vietnamese pheasnt (Lophura hatinhensis).
  • An Arizona black rattlesnake, Crotalus cerberus, at the Sedgwick County Zoo.
  • A federally endangered female desert bighorn sheep (Ovis canadensis nelsoni) named April at The Living Desert in Palm Desert, California.
  • A vulnerable (IUCN) and federally threatened Arizona desert tortoise (Gopherus agassizii) at the Rolling Hills Wildlife Adventure.
  • Picture of a fulvous whistling duck (Dendrocygna bicolor) at The Living Desert in Palm Desert, California.
  • Photo: A proboscis monkey (Nasalis larvatus) at the Singapore Zoo.
  • Pickerel frog (Lithobates palustris) at the National Aquarium in Baltimore.
  • Photo: Two reticulate crayfish (Faxonius erichsonianus) at the West Liberty University Crayfish Conservation Lab in West Liberty, West Virginia.
  • Flap-necked chameleon (Chamaeleo dilepis) collected in Gorongosa National Park.
  • Picture of a crowned eagle (Stephanoaetus coronatus) at the LA Zoo.
  • Photo: A Southern smooth snake (Coronella girondica) at Centro Fauna Selvatica "Il Pettirosso".
  • Photo: Flamefish (Apogon maculatus) at the Albuquerque BioPark Aquarium.
  • Photo: A male Golden pheasant (Chrysolophus pictus) at Pheasant Heaven.
  • Photo: A boring sponge (Cliona celata) at Gulf Specimen in Panacea, Florida.
  • A Congo dwarf clawed frog (Hymenochirus boettgeri) at the Vancouver Aquarium.
  • A eastern willet (Tringa semipalmata semipalmata) caught for banding along the Jersey shore.
  • A squirrel tree frog (Hyla squirella) at the Vancouver Aquarium.
  • Photo: A barred buttonquail (Turnix suscitator) at the Plzen Zoo.
  • A vulnerable (IUCN) western pond turtle (Actinemys marmorata) at the Oregon Zoo.
  • Photo: A critically endangered Loa water frog (Telmatobius dankoi) at the Santiago Zoo in Chile.
  • A North American beaver (Castor canadensis) at Nebraska Wildlife Rehab.
  • Photo: Common tiger glassywing (Tithorea harmonia) at Butterfly Pavilion.
  • Picture of a grey-necked wood rail (Aramides cajaneus cajaneus) at the Nispero Zoo.
  • A two-day old black duiker (Cephalophus niger) at the LA Zoo.
  • Photo: Gray's Malayan sticks (Lonchodes brevipes) at the Houston Zoo.
  • A bumble bee walking toad (Melanophryniscus stelzneri) at Seattle Reptiles.
  • Photo: An endangered timneh parrot (Psittacus timneh) at the Jurong Bird Park.
  • Photo: Orange lacewing (Cethosia penthesilea) at Melbourne Zoo.
  • Photo: A triangulate cobweb spider, or house spider (Steatoda triangulosa) at the Butterfly Pavilion.
  • A barking gecko or thick-tailed gecko (Underwoodisaurus milii) at the Tennessee Aquarium.
  • Photo: Southeast Asian katydid (Mecapoda elongata) at the Audubon Insectarium.
  • Southern leopard frog ( Lithobates sphenocephalus ) at the Denver zoo.
  • Picture of a green aracari (Pteroglossus viridis) at the Lowry Park Zoo.
  • Photo: A female black kalij pheasant (Lophura leucomelanos moffitti) at a private collection.
  • An endangered Goodfellow's tree-kangaroo (Dendrolagus goodfellowi) at the Melbourne Zoo.
  • An endangered (IUCN) Beal's four-eyed turtle (Sacalia bealei) at the Tennessee Aquarium.
  • Photo: A pair of masked bobwhite quail (Colinus virginianus ridgwayi) at the Sutton Avian Research Center near Bartlesville, Oklahoma.
  • Photo: A female Eurasian golden oriole (Oriolus oriolus) from the Budapest Zoo.
  • Photo: A pair of Ijima’s copper pheasants (Syrmaticus soemmerringii ijimae) from a private collection.
  • Miss Sandy Hill, a federally endangered Mississippi sandhill crane (Grus canadensis pulla), at the Audubon Center for Research of Endangered Species. Only 110 of this sandhill crane subspecies exists in the wild. Only another 45 birds are in captivity.
  • Photo: A giant Blomberg toad (Rhaebo blombergi) at Centro Jambatu in Quito, Ecuador.
  • A mata mata (Chelus fimbriatus) at Reptile Gardens.
  • Photo: An Elegant Acraea (Acraea egina) in Libreville, Gabon.
  • Picture of a Florida crown conch (Melongena corona) at the Brevard Zoo.
  • Photo: Red-spotted assassin bug (Platymeris rhadamanthus) at the Insectarium in New Orleans.
  • Picture of a brown tufted capuchin (Cebus apella apella) at the Rolling Hills Wildlife Adventure.
  • Photo: Garden slug (Arion hortensis) wild caught in Boise, Idaho
  • Photo: Reticulated collared lizard (Crotaphytus reticulatus) at the San Antonio Zoo. This species is listed as vulnerable.
  • Common postman (Heliconius melpomene) at Saint Louis Zoo.
  • Photo: Jackson's three horned chameleon (Trioceros jacksonii) at the Budapest Zoo.
  • An egg sack of a praying mantis (Mantis religiosa) at the Houston Zoo.
  • Slackwater darters (Etheostoma boschungi) at the Conservation Fisheries, Knoxville, Tennessee. (IUCN: Endangered, US: Threatened)
  • Picture of a Radjah shelduck, Tadorna radjah, at Sylvan Heights Bird Park.
  • Picture of a fiery searcher beetle or catarpiller hunter (Calosoma scrutator) at the Houston Zoo.
  • Photo: A female giant Pacific octopus (Enteroctopus dofleini) at the Alaska SeaLife Center in Seward, AK.
  • A kori bustard (Ardeotis kori strthiunculus) named ‘Snake’ at Zoo Atlanta.
  • Photo: An aye-aye (Daubentonia madagascariensis) named Endora at Duke Lemur Center in Durham, North Carolina.
  • Photo: Black ibis (Pseudibis papillosa) at the Ahmedabad Zoo
  • Photo: A tarantula (Monocentropus lambertoni) from a private collection.
  • New River morph of a dyeing poison frog (Dendrobates tinctorius) from a private collection.
  • Picture of a vulnerable Steller's sea eagle (Haliaeetus pelagicus pelagicus) at the LA Zoo.
  • Photo: A female thorny walking stick (Trachyaretaon brueckneri) at the Exmoor Zoo.
  • Picture of a grizzly bear (Ursus arctos horribilis) at the Sedgwick County Zoo.
  • Picture of Southern pochards (Netta erythrophthalma) at the Sylvan Heights Bird Park.
  • A slender-legged treefrog (Osteocephalus species) near Limon, Ecuador.
  • Picture of a royal panaque (Panaque nigrolineatus) at Pure Aquariums.
  • Photo: Female variegate darter (Etheostoma variatum) collected from Big Darby Creek near Circleville, OH.
  • Photo: Dark-eared frog (Hylarana cubitalis) at Wroclaw Zoo.
  • Photo: Western tiger snake (Notechis scutatus occidentalis) from a private collection.
  • A Japanese giant salamander (Andrias japonicus) at the San Antonio Zoo. (IUCN: Near Threatened)
  • A Coqui frog (Eleutherodactylus coqui) at Zoo Atlanta. A very prolific frog from Puerto Rico that is now an invasive species in both Florida and Hawaii.
  • Photo: A silver-eared laughingthrush (Trochalopteron melanostigma) at the Prague Zoo.
  • Photo: Two-year-old blue eyed darner dragonfly nymph (Rhionaeschna multicolor) at Butterfly Pavilion in Westminster, Colorado.
  • Picture of a Santa Cruz gopher snake (Pituophis catenifer pumilis) at the Santa Barbara Zoo.
  • A rainbow scarab (Phanaeus vindex), with parasites riding on its neck, at the Houston Zoo.
  • An endangered (IUCN) and federally endangered Alabama red-bellied turtle (Pseudemys alabamensis) at the Tennesee Aquarium.
  • Photo: A juvenile knob-scaled lizard (Xenosaurus grandis grandis) at the San Antonio Zoo. This species is listed as vulnerable.
  • A vulnerable (IUCN) greater prairie-chicken (Tympanuchus cupido.)
  • A largescale stoneroller (Campostoma oligolepis).
  • A female Cape shoveler (Spatula smithii) at Safari Park Dvur Kralove.
  • A vulnerable Java finch (Padda (Lonchura) oryzivora) at the Safari Land Pet Store.
  • Photo: Southern coleto (Sarcops calvus melanonotus) at Eltoro Zoo de la Castellana, Inc., on Negros Island, Philippines.
  • Picture of a Hartlaub's duck (Pteronetta hartlaubii) at Sylvan Heights Bird Park.
  • Picture of a male white-winged scoter (Melanitta deglandi) or (Melanitta fusca deglandi) at Patuxent Wildlife Research Center.
  • Photo: A Midline knob-tailed gecko (Nephrurus vertebralis) from a private collection.
  • Photo: Plumbeous kite (Ictinia plumbea) at Parque Jaime Duque near Bogota, Colombia.
  • Photo: Scattered pore rope sponge, Aplysina fulva, at Gulf Specimen Marine Lab and Aquarium.
  • Photo: Atlas beetle (Chalcosoma caucasus) at the Bugarium at the Albuquerque BioPark.
  • An Australian osprey (Pandion haliaetus cristatus) at Healesville Sanctuary.
  • A vulnerable (IUCN) and federally endangered, nine-week-old clouded leopard cub (Neofelis nebulosa nebulosa) at the Columbus Zoo.
  • Photo: Variegated grasshopper (Zonocerus variegatus) at the Budapest Zoo.
  • A vulnerable (IUCN) and federally threatened polar bear (Ursus maritimus) at the Tulsa Zoo.
  • Photo: A female critically endangered ray-finned fish species (Garra festai) at Zoo Plzeň.
  • Arizona black rattlesnake (Crotalus oreganus cerberus).
  • A juvenile musk ox (Ovibos moschatus moschatus) at the University of Alaska in Fairbanks, AK.
  • Photo: An olivaceous monitor (Varanus olivaceus) at Avilon Zoo. The world's first breeding of this species was achieved at this zoo.
  • Borneo sucker (Gastromyzon punctulatus) at Zoo Negara.
  • Photo: A fishfly larva (Chauliodes pectinicornis) collected by the West Liberty University Crayfish Conservation Lab. This insect was collected near Davis, West Virginia
  • Photo: A Cameroon forest treefrog (Leptopelis brevirostris) from Bioko Island, Equatorial Guinea.
  • Photo: A Rhode Island red domestic chicken (Gallus gallus domesticus) in Lincoln, Nebraska.
  • Picture of a female greater snow goose, Chen caerulescens atlanticus, at Sylvan Heights Bird Park.
  • Photo: Jungle perch (Kuhlia rupestris) at the Freshwater Ecology and Marine Biology Dept. at Templestowe College.
  • A black stork (Ciconia nigra) at the Fort Wayne Children's Zoo.
  • A furrowed wood turtle (Rhinoclemmys areolata) at the Chapultepec Zoo in Mexico City.
  • A Florida box turtle (Terrapene carolina bauri) from a private collection.
  • Picture of sea pansies (Renilla mulleri) at Gulf Specimen Marine Lab and Aquarium.
  • Picture of a Malaysian frog or mahogany frog (Hylarana luctuosa) from a private collection.
  • Photo: Particoloured flying squirrel (Hylopetes alboniger) at the Moscow Zoo.
  • A critically endangered (IUCN) and federally endangered hawksbill turtle (Eretmochelys imbricata) at the XCaret Resort in Mexico.
  • Picture of a Maxima clam (Tridacna maxima) at Omaha's Henry Doorly Zoo and Aquarium.
  • A slug caught from the wild.
  • Photo: A male Lesser Egyptian jerboa (Jaculus jaculus) named Osiris at the Philadelphia Zoo.
  • A female central longear sunfish (Lepomis megalotis megalotis) collected from Big Darby Creek near Circleville, OH.
  • Photo: A green keel-bellied lizard (Gastropholis prasina) at Aquarium Berlin.
  • Photo: Least killifish (Heterandria formosa) from a private collection in Knoxville, Tennessee.
  • Photo: Endangered Varatraza panchax (Pachypanchax varatraza) at Plzen Zoo in the Czech Republic.
  • Picture of an Eastern ribbon snake or common ribbon snake (Thamnophis sauritus sauritus) at the National Mississippi River Museum and Aquarium in Dubuque, Iowa.
  • An Egyptian predator beetle (Anthia sexmaculata) at Safari Park Dvur Kralove.
  • Picture of a spectacled langur, or dusky leaf monkey (Trachypithecus obscurus) at the Dallas Zoo.
  • Picture of a great blue heron (Ardea herodias herodias) being cared for by Nebraska Wildlife Rehab.
  • Photo: A common woodlouse (Oniscus asellus) at Parque Biol—gico in Vila Nova de Gaia, Porto, Portugal.
  • Picture of a pygmy hippopotamus (Choeropsis liberiensis) named Betty at the Omaha Zoo. Listed as endangered (IUCN)
  • A critically endangered (IUCN) and federally endangered Sumatran tiger (Panthera tigris sumatrae).
  • A federally endangered yellow-footed rock wallaby (Petrogale xanthopus) at Omaha Zoo's Wildlife Safari Park.
  • Photo: European honey buzzard (Pernis apivorus) from the Budapest Zoo.
  • Picture of a Male and female redhead ducks (Aythya americana) at the Sylvan Heights Bird Park.
  • Photo: An endangered Higgins eye pearly mussel (Lampsilis higginsii) at the Genoa National Fish Hatchery, Genoa, Wisconsin.
  • Leafcutter ants (Atta spp.) at the St. Louis Zoo.
  • Photo: A male wolf spider (Schizocosa communis) from the University of Nebraska-Lincoln.
  • Picture of a vulnerable collared brown lemur (Eulemur collaris) at the Lemur Conservation Foundation near Myakka City, Florida.
  • A male Cape shoveler (Spatula smithii) at Safari Park Dvur Kralove.
  • A rhinoceros snake (Rhynchophis boulengeri) at the St. Louis Zoo.
  • Photo: Yellowfin goby (Acanthogobius flavimanus) at East Bay Regional Park District.
  • Photo: Chromidotilapia melaniae at L'aquarium tropical du palais de la Porte DorŽe.
  • A critically endangered (IUCN) and federally endangered Panamanian golden frog (Atelopus zeteki) at the Cheyenne Mountain Zoo.
  • Picture of a blue naped mousebird (Urocolius macrourus) at the Jurong Bird Park.
  • Picture of a vulnerable giant anteater (Myrmecophaga tridactyla) named Ellie Mae with her pup, Zander, at the Caldwell Zoo in Tyler, Texas. Zander was born in January, 2013.
  • A piping plover (Charadrius melodus). (US: Endangered)
  • Picture of an Egyptian cobra (Naja haje) at the Dallas Zoo. This is an undescribed subspecies from northern Africa.
  • Photo: Smallmouth redhorse (Moxostoma breviceps) collected from Big Darby Creek near Circleville, OH.
  • Photo: A common house cricket (Acheta domestica).
  • Photo: An Asian glossy starling (Aplonis panayensis panayensis) at the Avilon Zoo.
  • A Houston toad (Anaxyrus houstonensis) at the San Antonio Zoo. (US: Endangered, IUCN: Endangered)
  • Picture of a vulnerable Palawan binturong (Arctictis binturong whitei) at the Nashville Zoo.
  • Picture of a red-sided garter snake (Thamnophis sirtalis parietalis) at Reptile Gardens.
  • A Central Plateau dusky rattlesnake (Crotalus triseriatus triseriatus) at the San Antonio Zoo, San Antonio, Texas.
  • Vulnerable Pinyon jay (Gymnorhinus cyanocephalus) at the University of Nebraska-Lincoln. This and other corvid species are studied to learn how cognition evolved, how animals use cognitive abilities to solve problems in nature and how cognitive abilities can affect the evolutionary process.
  • Photo: A female giant Pacific octopus (Enteroctopus dofleini) at the Alaska SeaLife Center in Seward, AK.
  • Photo: Redside dace (Clinostomus elongatus) collected from Big Darby Creek near Circleville, OH.
  • Photo: Plateau orangethroat Darter (Etheostoma squamosum) at the Oklahoma City Zoo. This animal was collected in Lower Illinois River, Sequoyah County, Oklahoma.
  • Photo: A Hiwassee Crayfish (Cambarus hiwasseensis) at the West Liberty University Crayfish Conservation Lab in West Liberty, Virginia.
  • Young torresian crows (Corvus orru) at a wildlife rescue.
  • An endangered (IUCN) robber or muscial rainfrog/Panama robber frog (Pristimantis museosus) at Zoo Atlanta.
  • Photo: Blue winged parrotlet (Forpus xanthopterygius flavissimus) at Loro Parque Fundacion.
  • Photo: A tarantula (Phormingochilus everetti) from a private collection.
  • Photo: A female RiedelÕs eclectus parrot, Eclectus roratus riedeli, at Loro Parque Fundacion.
  • The endangered grey gibbon (Hylobates muelleri muelleri) may not be seen in captivity much longer. There are now too few in captivity to keep their population sustained and too few in the wild to bring more in. With limited space and funding, zoos must make hard choices every year in deciding which species to breed and which to let go, or 'phase out'.
  • Dung beetles (Proagoderus brucei) from the wild in Cameroon.
  • Photo: A Gran Canaria giant lizard (Gallotia stehlini) at the Plzen Zoo in the Czech Republic.
  • A bull trout (Salvelinus confluentus) from Bighorn Creek, part of the Kootenay River system. (IUCN: Vulnerable; US: Federally threatened)
  • Picture of a vulnerable Indian peacock softshell turtle (Nilssonia hurum) at the Gharial and Turtle Rehabilitation Center.
  • Picture of a White-eared bulbul (Pycnonotus leucotis leucotis) at Sylvan Heights Bird Park.
  • Picture of a vulnerable dwarf Burmese python (Python bivittatus progschai) from a private collection.
  • A Sharp-shinned hawk (Accipiter striatus) at Raptor Recovery Nebraka.
  • Raggiana Bird-of-paradise (Paradisaea raggiana augustaevictoriae) at the Cincinnati Zoo.
  • Mallard (Anas platyrhynchos) ducklings.
  • Picture of a diablito, also known as a little devil poison frog (Oophaga sylvatica) Bilsa, Ecuador locality, from a private collection.
  • A hottentot teal (Anas hottentota) at the Kansas City Zoo.
  • A greater roadrunner (Geococcyx californianus) at the Sutton Avian Research Center, Bartlesville, Oklahoma.
  • A Platte River caddisfly (Ironoquia plattensis) in its larval stage.
  • Photo: Eurasian oystercatcher (Haematopus ostralegus) at Monticello Center in Italy.
  • Photo: Wrinkled grasshopper (Hippiscus ocelote) at Cedar Point Biological Station.
  • Photo: Cuban burrowing cockroach (Byrsotria fumigata) at Wroclaw Zoo.
  • Picture of a Yuman desert fringe-toed lizard (Uma rufopunctata) at the Sedgwick County Zoo.
  • Photo: A FranklinÕs ground squirrel (Poliocitellus franklinii) at the Wildlife Rescue Center of Minnesota.
  • Picture of Gabby, a 1 1/2-year-old serval (Leptailurus serval) at the Central Florida Zoo.
  • Photo: A Bonelli’s eagle (Aquila fasciata fasciata) at Sia, the Comanche Nation Ethno-Ornithological Initiative.
  • Photo: A Florida mud turtle at Reptile Gardens.
  • A vulnerable Pebas stubfoot toad (Atelopus spumarius) tadpole collected near Pilalo, Ecuador.
  • A pair of white-crowned robin-chats (Cossypha albicapillus albicapillus) at the Columbus Zoo.
  • Photo: Blue crayfish (Cambarus monongalensis) from the wild.
  • European fire salamander (Salamandra salamandra bernardezi) at the St. Louis Zoo.
  • Picture of a Venezuela lancehead (Bothrops venezuelensis) at the Sedgwick County Zoo.
  • Photo: A giant bent-toed gecko (Cyrtodactylus irianjayensis) at a private collection.
  • Photo: Auratus cichlid (Melanochromis auratus) at L'aquarium tropical du palais de la Porte DorŽe.
  • Photo: A Tunisian tortoise (Testudo graeca nabeulensis) at Prague Zoo. This species is listed as vulnerable by IUCN. This animal is the offspring of parents that were confiscated from the pet trade via the Prague Airport.
  • Miss Sandy Hill, a federally endangered Mississippi sandhill crane (Grus canadensis pulla), at the Audubon Center for Research of Endangered Species. Only 110 of this sandhill crane subspecies exists in the wild. Only another 45 birds are in captivity.
  • Picture of a brown-throated parakeet (Eupsittula pertinax arubensis) at Jurong Bird Park, part of Wildlife Reserves Singapore.
  • Photo: L260 Queen Arabesque plecostomus (Hypancistrus sp.) from a private collection.
  • A vulnerable Pesquet's parrot (Psittrichas fulgidus psittrichadini) at the Houston Zoo.
  • Photo: A freshwater crocodile (Crocodylus johnstoni) at Reptile Gardens.
  • Photo: A female Venezuelan red howler monkey (Alouatta seniculus juara) at Mantenedor da Fauna Silvestre Cariuá.
  • Photo: African flower chafer (Mecynorhina polyphemus) at the Insectarium in New Orleans.
  • A rough-skinned newt (Taricha granulosa) at the Oregon Zoo.
  • Brown dart frog or Pratt’s rocket frog (Colostethus pratti). The photo was taken at the National Aquarium in Baltimore.
  • A mallard (Anas platyrhynchos) duckling.
  • Photo: A roadside hawk (Rupornis magnirostris magniplumis) at the Membeca Lagos Farm, near Rio de Janeiro, Brazil.
  • Picture of a sulphur-crested cockatoo (Cacatua galerita).
  • Picture of a male, critically endangered Yangtze giant softshell turtle (Rafetus swinhoei) at the Suzhou Zoo in China.
  • Picture of a Yuma myotis (Myotis yumanensis) at Northwest Trek Wildlife Park in Eatonville, Washington.
  • Photo: Striped dottyback (Pseudochromis sankeyi) at Pure Aquariums.
  • Picture of a cotton mouse (Peromyscus gossypinus palmarius) from the wild in Florida.
  • A captive English/house sparrow (Passer domesticus) photographed at a studio in Lincoln, NE.
  • Photo: A bigeye shiner (Notropis boops) at the Pontotoc Ridge Preserve near Connerville, OK.
  • Photo: A brown necked parrot (Poicephalus fuscicollis) at the Jurong Bird Park.
  • Photo: A Burmese star tortoise (Geochelone platynoa), at Zoo Atlanta.
  • Photo: A goldeye (Hiodon alosoides) at the Schramm Education Center near Gretna, NE.
  • Banded newt (Ommatotriton vittatus) at the Tennessee Aquarium.
  • A studio portrait of a barbary dove (Streptopelia risoria.)
  • Miami blue butterfly (Cyclargus thomasi bethunebakeri). This species is being captive bred at the McGuire Center at the Univ. of Florida. Thousands have been released into the wild in South Florida over the past three years. So far, results are indeterminate. Fewer than 250 exist in the wild, making it one of the rarest butterflies in North America.
  • Photo: A timber rattlesnake (Crotalus horridus horridus) at Reptile Gardens.
  • Mallard (Anas platyrhynchos) ducklings.
  • Photo: A common noctule bat (Nyctalus noctula noctula) at Centro Fauna Selvatica "Il Pettirosso".
  • Photo: A female palm cockatoo (Probosciger aterrimus goliath) at Loro Parque Fundacion.
  • Photo: A male grey pileated finch (Coryphospingus pileatus pileatus) at the Membeca Lagos Farm, near Rio de Janeiro, Brazil.
  • Picture of Katrina, a federally endangered, black phased African leopard (Panthera pardus pardus), at the Alabama Gulf Coast Zoo.
  • Picture of a vulnerable Antipodes Island parakeet (Cyanoramphus unicolor) at the Kiwi Birdlife Park in Queenstown, New Zealand.
  • Picture of an orange-chinned parakeet (Brotogeris jugularis) at the National Aviary breeding center.
  • Picture of a brush bronzewing (Phaps elegans) at the Healesville Sanctuary.
  • An upside-down jelly fish (Cassiopea sp.) from the wild on Saddlebunch Key, Florida.
  • Photo: Fire eel (Mastacembelus erythrotaenia) at Zoo Negara.
  • Picture of a warty sea anemone (Bunodosoma cavernata) at Gulf Specimen Marine Lab and Aquarium.
  • A gecko (Hemidactylus fasciatus) with a broken tail, which will grow back, from Bioko Island, Equatorial Guinea.
  • Picture of a red spitting cobra (Naja pallida) at the Oklahoma City Zoo.
  • Photo: A Great Plains skink (Plestiodon obsoletus) collected in Jefferson County, Nebraska.
  • An endangered (IUCN) and federally endangered slender-horned gazelle (Gazella leptoceros) named Adin at The Living Desert in Palm Desert, California.
  • A Viceroy butterfly (Limenitis archippus) at the Lincoln Children's Zoo in Lincoln, Nebraska.
  • Photo: A Giant burrowing cockroach (Macropanesthia rhinoceros) at the Taronga Zoo in Sydney.
  • Photo: A yellow or eastern mantella (Mantella crocea) at the National Mississippi River Museum and Aquarium in Dubuque, IA.
  • Photo: A Spanish pond turtle (Mauremys leprosa) at Parque Biologico.
  • Picture of a European herring gull (Larus argentatus) in third year plumage at the Virginia Aquarium.
  • Picture of an emerald tree skink (Lamprolepis smaragdina) at the Virginia Zoo
  • Photo: A mole salamander (Ambystoma talpoideum) from a private collection.
  • Picture of a gold tetra (Hemigrammus rodwayi) at Pure Aquariums.
  • Photo: An Angolan or half-banded gartersnake (Elapsoidea semiannulata) at the Sedgwick County Zoo in Wichita, Kansas.
  • Photo: Longnose sucker (Catostomus catostomus) at the Alaska SeaLife Center in Seward, AK.
  • Photo: A male Marco Polo sheep (Ovis ammon polii) at Tierpark Berlin.
  • Picture of a common wombat (Vombatus ursinus tasmaniensus).
  • Photo: A false brook salamander (Isthmura bellii) at a private collection.
  • Malachite green butterfly (Siproeta stelenes) at the Florida Museum of Natural History.
  • Photo: An African pied hornbill (Tockus fasciatus) at Parque Biologico.
  • A Jefferson salamander (Ambystoma jeffersonianum) at the National Mississippi River Museum and Aquarium in Dubuque, IA.
  • Photo: The wing of a black capped lory (Lorius lory salvadorii) at Loro Parque Fundacion.
  • A federally endangered Karner blue butterfly, Lycaeides melissa samuelis.
  • Photo: A wreathed hornbill (Rhyticeros undulatus) at the LA Zoo. This species is listed as vulnerable on the IUCN Red List.
  • Photo: Tulip shell (Fasciolaria tulipa), with eggs from Gulf Specimen Marine Laboratories.
  • A lady amherst's pheasant (Chrysolophus amherstiae) at the Gladys Porter Zoo in Brownsville, Texas.
  • Photo: Pumpkinseed sunfish (Lepomis gibbosus) at the Loveland Living Planet Aquarium in Draper, UT.
  • Photo: Bluntnose minnow (Pimephales notatus) collected from Big Darby Creek near Circleville, OH.
  • Photo: A Ural owl chick (Strix uralensis liturata) from Plzen Zoo in the Czech Republic.
  • Photo: A male American redstart (Setophaga ruticilla) at the Wildlife Rehab Center of Minnesota.
  • Picture of a zebra paper wasp (Polistes exclamans) at the Dallas Zoo.
  • Photo: A Peter's keeled plated lizard (Tracheloptychus petersi) named Miles, from a private collection.
  • Photo: Robust crayfish (Cambarus robustus) at West Liberty University Crayfish Lab, West Liberty, WV. Collected from the wild.
  • Photo: A western diurnal gecko (Gonatodes caudiscutatus) at Centro Jambatu in Quito, Ecuador.
  • Photo: An adult female SutherlandÕs funnelweb spider (Atrax sutherlandi) from the Melbourne Museum
  • Photo: A tawny owl (Strix aluco aluco) at Parque Biologico.
  • Photo: Brown color morph of the Limosa harlequin frog (Atelopus limosus) at the Panama Amphibian Rescue and Conservation Project.
  • A marbled newt (Triturus marmoratus) photographed at Conservation Fisheries, a breeding center for rare native stream fish.
  • Photo: Frogs and Toads Montage
  • Photo: A citrus swallowtail or orchard swallowtail (Papilio demodocus) at the Butterfly Pavilion.
  • A giant panda (Ailuropoda melanoleuca) at Zoo Atlanta. This endangered (IUCN) and federally endangered species is native to China.
  • Photo: A southern lapwing (Vanellus chilensis lampronotus) at Fundacao Jardim Zoologico de Brasilia.
  • A male golden pheasant (Chrysolophus pictus) Padmaja Naidu Himalayan Zoological Park in Darjeeling, India.
  • A federally endangered West African slender-snouted crocodile (Mecistops cataphractus) from the private collection of Curt Harbsmeier.
  • A striped skunk (Mephitis mephitis).
  • Photo: A boulder short-winged grasshopper (Melanoplus boulderenis) at the Niwot Ridge Long Term Ecological Research site, near Nederland, CO. This research site is funded by the National Science Foundation.
  • Photo: Three eyelash frogs (Caratobatrachus gnentheri) at Omaha's Henry Doorly Zoo.
  • Picture of a brown bullhead (Ameiurus nebulosus) at the Buttonwood Park Zoo in New Bedford, Massachusetts.
  • Photo: Purple bellied lory (Lorius hypoinochrous devittatus) at Loro Parque Fundacion.
  • Photo: A female red junglefowl (Gallus gallus gallus) at the Plzen Zoo in the Czech Republic.
  • A black-throated magpie-jay (Calocitta colliei) from the Gladys Porter Zoo in Brownsville, Texas.
  • Photo: Crested sculpin, Blepsias bilobus, at the Alaska SeaLife Center.
  • Photo: A swan goose (Anser cygnoides) at the Miller Park Zoo. This species is listed as vulnerable on the IUCN Red List.
  • Picture of a coconut lorikeet (Trichoglossus haematodus haematodus) at the Kansas City Zoo.
  • A red shiner (Cyprinella lutrensis).
  • A vulnerable Madagascar velvet gecko (Blaesodactylus boivini) at the Omaha Zoo.
  • A half-day-old hatchling leatherback turtle (Dermochelys coriacea) from Bioko Island. (IUCN: Critically Endangered, US: Endangered)
  • Photo: A yellow scroll coral (Turbinaria reniformis) at the Akron Zoo. This species is listed as vulnerable by IUCN.
  • A West African dwarf crocodile (Osteolaemus tetraspis tetraspis) at the Lincoln Children's Zoo. This species is federally endangered and listed as vulnerable on IUCN.
  • A vulnerable (IUCN) and federally threatened polar bear (Ursus maritimus) at the Tulsa Zoo.
  • Picture of an endangered red panda (Ailurus fulgens fulgens) at the Lincoln Children's Zoo.
  • Photo: Tiger cowrie (Cypraea tigris) at Butterfly Pavilion.
  • A mudpuppy (Necturus maculosus) at the Genoa National Fish Hatchery.
  • An endangered Goodfellow's tree-kangaroo (Dendrolagus goodfellowi) at the Melbourne Zoo.
  • Photo: A domestic rat at the George M. Sutton Avian Research Center.
  • Picture of a tapajos red head (Geophagus sp. "Tapajos") at Pure Aquariums.
  • An eastern coachwhip (Masticophis flagellum flagellum) from a private collection.
  • An endangered (IUCN) pearl darter (Percina aurora), at conservation fisheries, a native stream fish breeding center.
  • Picture of a critically endangered male and female white-cheeked gibbon(Nomascus leucogenys) at the Gladys Porter Zoo.
  • A yellow-backed duiker (Cephalophus silvicultor) at the Gladys Porter Zoo in Brownsville, Texas.
  • Picture of a vulnerable spiny or thorny seahorse (Hippocampus histrix) at the Newport Aquarium.
  • Photo: Cabot's tragopan (Tragopan caboti) at the St. Augustine Alligator Farm.
  • Picture of a spiny-backed orbweaver spider or crab spider (Gasteracantha cancriformis) at the Audubon Insectarium in New Orleans.
  • Photo: Texas fawnsfoot (Truncilla macrodon) from the Crustacean and Molluskan Ecology Lab at Auburn University.
  • Midland painted turtle (Chrysemys picta marginata) at the Detroit Zoo.
  • Splendid mantella (Mantella pulchra) at the Detroit Zoo. (IUCN: Vulnerable)
  • An Australian osprey (Pandion haliaetus cristatus) at Healesville Sanctuary.
  • Photo: Magda, a Eurasian tawny eagle (Aquila rapax orientalis) at the Lisbon Zoo
  • A big brown bat (Eptesicus fuscus fuscus) at Nebraska Wildlife Rehab.
  • Photo: A common raven (Corvus corax sinuatus) at the Wildlife Rehab Center of Minnesota (WRCMN). This bird had broken its wing and was wearing a splint to help it heal.
  • Picture of a Zambezi flapshelled turtle (Cycloderma frenatum) at the National Mississippi River Museum and Aquarium in Dubuque, Iowa.
  • Photo: Kelp greenling (Hexagrammos decagrammus) at East Bay Regional Park District.
  • Photo: Brassy minnows (Hybognathus hankinsoni) at Schramm Education Center near Gretna, NE.
  • Photo: An Apalachee shiner (Pteronotropis grandipinnis) from a private collection in Knoxville, Tennessee.
  • Photo: A squirrel tree frog (Hyla squirrella) at the Riverbanks Zoo.
  • Argentinian waxy frog (Phyllomedusa sauvagii) at the Sedgwick County Zoo in Wichita, Kansas.
  • Photo: An Atlantic cod (Gadus morhua) at the Maine State Aquarium.
  • Photo: White-cheeked turaco (Tauraco leucotis leucotis) at the Bramble Park Zoo.
  • Photo: A Smith's bush squirrel (Paraxerus cepapi) at the Prague Zoo.
  • Studio portrait of a red knot (Calidris canutus). The species is a candidate for listing under the Endangered Species Act due to a rapid decline in population. It is on one food during it's northward migration: horseshoe crab eggs. Overfishing of the crabs has led a dramatic the decline of both knots and crabs.
  • Photo: Southern coleto (Sarcops calvus melanonotus) at Eltoro Zoo de la Castellana, Inc., on Negros Island, Philippines.
  • A lark sparrow (Chondestes grammacus) at the Brown Ranch, Texas.
  • A Bennet's or red-necked wallaby (Macropus rufogriseus) at the Gladys Porter Zoo in Brownsville, Texas.
  • Photo: Giant Asian mantis (Hierodula grandis) at the Budapest Zoo.
  • A portrait of a bald eagle (Haliaeetus leucocephalus).
  • A vulnerable robber frog (Pristimantis calcarulatus) near Mindo, Ecuador.
  • Photo: Giant forest scorpion (Heterometrus spinifer) at the Bugarium at the Albuquerque BioPark.
  • Photo: A Javan flowerpecker (Dicaeum sanguinolentum sanguinolentum) at Bali Safari.
  • Photo: An orangetail shiner (Pteronotropis merlini) from a private collection in Knoxville, Tennessee.
  • Picture of an endangered rowi kiwi or okarito kiwi (Apteryx rowi) at the West Coast Wildlife Centre in Franz Josef Glacier, New Zealand.
  • Photo: A male American redstart (Setophaga ruticilla) at the Wildlife Rehab Center of Minnesota.
  • Photo: Clown treefrog (Dendropsophus leucophyllatus) at the Nashville Zoo.
  • Three-toed Box Turtle, Terrapene carolina triunguis, at the Sedgwick County Zoo.
  • A yellow and blue poison dart frog or dyeing poison dart frog (Dendrobates tinctorius) at the Rolling Hills zoo.
  • Picture of a Swainson's thrush (Catharus ustulatus), at St. Francis Wildlife Association, a wildlife rescue center near Quincy, Florida.
  • Picture of a federally endangered jaguar, Panthera onca, at the Omaha Henry Doorly Zoo
  • Photo: A pair of El Tambo marsupial frogs (Gastrotheca elicioi) at Centro Jambatu in Quito, Ecuador.
  • Picture of a sara longwing (Heliconius sara fulgidus) in Gamboa, Panama.
  • Coonstripe Shrimp (Pandalus hypsinotis) at the Alaska SeaLife Center in Seward, AK.
  • Photo: A long-eared owl (Asio otus otus) at Wildwood Trust near Canterbury, England.
  • Picture of an endangered Matschie's tree-kangaroo (Dendrolagus matschiei) at Zoo Miami.
  • A critically endangered (IUCN) and federally endangered oyster mussel (Epioblasma capsaeformis) displaying its blue-white mantle. These mussels and many others are in danger of extinction because of habitat loss due to such as impoundments and pollution. Pollution from coal mining in the Clinch River watershed is of special concern. The fine sedimentation that comes downstream from the mines is thought to impede mussel survival.
  • Photo: A northern short-tailed shrew (Blarina brevicauda) at Nebraska Wildlife Rehab.
  • Wulfing’s stick insect (Acrophylla wuelfingi) at the Wild Life Sydney Zoo."
  • Photo: A black sea hare (Aplysia vaccaria) at the Butterfly Pavilion.
  • Picture of an endangered white-tailed black cockatoo (Calyptorhynchus baudinii) at the Lowry Park Zoo.
  • Photo: Cochise milksnake (Lampropeltis triangulum) at the Arizona- Sonora Desert Museum.
  • Partula snails (Partula nodosa) at the St. Louis Zoo's Monsanto Insectarium. Once found in French Polynesia, this species is now extinct in the wild.
  • A Santa Rosa beach mouse (Peromyscus polionotus leucocephalus) at the USFWS office in Panama City, FL. This and several other beach mice subspecies are imperiled due to beach development. This species is also rare but is not currently listed under the ESA.
  • Picture of two critically endangered spider tortoises (Pyxis arachnoides arachnoides) at the Houston Zoo.
  • A thirteen-lined ground squirrel (Ictidomys tridecemlineatus) at the Milford Nature Center.
  • Photo: Mating Vietnamese prickly stick insects (Neohirasea maerens) at Wroclaw Zoo.
  • Photo: Northern Mexican garter snake (Thamnophis eques megalops) at the Albuquerque BioPark Aquarium.
  • Photo: A greater rhea (Rhea americana) at the Audubon Zoo, part of the Audubon Nature Institute.
  • A long-haired rousette (Rousettus lanosus) at the Lincoln Children's Zoo.
  • Photo: A grass carp (Ctenopharyngodon idella) at the Schramm Education Center near Gretna, NE.
  • Photo: A rhinoceros iguana (Cyclura cornuta) at Parco Natura Viva in Bussolengo, Italy.
  • A Rowley's palm pit viper (Bothriechis rowleyi) at the St. Louis Zoo.
  • Gordon's purple mossy frogs (Theloderma gordoni) play dead at Reptile Gardens.
  • Photo: Walking stick (Trachyaretaon sp. "Negros") at the Budapest Zoo.
  • A male (left) and female brown-headed cowbird (Molothrus ater) at the San Antonio Zoo.
  • Photo: Caterpillar of the purple mort bleu (Eryphanis polyxena) at Butterfly Pavilion in Westminster, Colorado.
  • A pied mossy frog (Theloderma corticale) at the Houston Zoo.
  • Photo: Fiery-shouldered parakeet (Pyrrhura egregia) from the town of Honnecourt Sur Escault, France.
  • Photo: A male Sumba hornbill (Rhyticeros everetti) at Bali Bird Park in Bali, Indonesia.
  • Picture of a European pond turtle (Emys orbicularis) at the National Mississippi River Museum and Aquarium in Dubuque, Iowa.
  • A hooded pitta (Pitta sordida) at the Columbus Zoo.
  • Picture of a female Bewick's swan, Cygnus columbianus bewickii, at Sylvan Heights Bird Park.
  • Photo: A critically endangered 18-year-old male tamaraw or Mindoro dwarf buffalo (Bubalus mindorensis) at Tamaraw Gene Pool Farm.
  • Photo: Malaysian orange huntsman spider, often called the David Bowie spider (Heteropoda davidbowie) from a private collection.
  • Photo: A cork bark leaf-tailed gecko (Uroplatus pietschmanni) from a private collection.
  • A Common chuckwalla, Sauromalus ater, at the Plzen Zoo.
  • Photo: A rainbow snake (Farancia erytrogramma) collected at Choctawhatchee River, FL.
  • Photo: A female American rubyspot damselfly (Hetaerina americana) at Cedar Point Biological Station.
  • Photo: A bluehead chub (Nocomis leptocephalus) from a private collection in Knoxville, Tennessee.
  • Black crocodile newt (Tylototriton taliangensis) at the National Mississippi River Museum and Aquarium in Dubuque, IA.
  • Picture of a Congo tetra (Phenacogrammus interruptus) at Pure Aquariums.
  • Photo: An African pied hornbill (Tockus fasciatus) at Parque Biologico.
  • An endangered Rio Azuela glass frog (Hyalinobatrachium pellucidum) collected near Pilalo, Ecuador.
  • Picture of a Northern olingo (Bassaricyon gabbii) at the PanAmerican Conservation Association in Gamboa, Panama.
  • Picture of a Madagascar tree boa (Sanzinia madagascariensis) at the Dallas World Aquarium.
  • Photo: Western fence lizard (Sceloporus occidentalis) at Nebraska Wildlife Rehab.
  • Photo: A great Mormon (Papilio memnon lowii) at Davao Butterfly House.
  • Photo: A Brazilian red tarantula (Nhandu carapoensis) at Museum of Nature South Tyrol.
  • Picture of a grey-necked wood rail (Aramides cajaneus) at the Omaha Zoo.
  • Photo: A male Florida Keys mole skink (Plestiodon egregius egregius) wild caught at Big Pine Key, Florida.
  • Photo: Jabiru stork (Jabiru mycteria) at the National Aviary of Colombia (Aviario Nacional de Colombia).
  • Photo: A male boat-tailed grackle (Quiscalus major major) at Rogers Wildlife Rehabilitation in Hutchins, TX.
  • Photo: An Alabama map turtle (Graptemys pulchra) at the Cheyenne Mountain Zoo.
  • A buff-crested bustard (Lophotis gindiana) at the Columbus Zoo.
  • A western ribbon snake (Thamnophis proximus proximus) from the Shawnee National Forest.
  • Photo: A critically endangered Delta smelt, Hypomesus transpacificus, at the University of California, Davis.
  • Photo: Black Kite (Milvus migrans lineatus) at the Angkor Centre for Conservation of Biodiversity (ACCB) in Siem Reap, Cambodia.
  • Photo: Korean lumpsucker (Eumicrotremus taranetzi) at Aquarium of the Pacific in Long Beach, CA.
  • A carolina anole (Anolis carolinensis) from Cape Canaveral Florida.
  • Picture of an endangered Persian leopard (Panthera pardus saxicolor) at the Budapest Zoo.
  • Golden redhorse (Moxostoma erythrurum) at the Minnesota Department of Natural Resources Center for Aquatic Mollusk Programs.
  • Photo: Hoopoe (Upupa epops epops) at Alpenzoo in Innsbruck, Austria.
  • Photo: Eurasian sparrowhawk (Accipiter nisus) at the Budapest Zoo.
  • Coyote puppies (Canis latrans).
  • Picture of an endangered Black-breasted leaf turtle (Geoemyda spengleri spengleri) at the detroit zoo.
  • A maize calligrapher hoverfly (Toxomerus politus) from near Adams, NE.
  • Photo: A Javan common palm civet (Paradoxurus hermaphroditus musanga) at Taman Safari.
  • A red fox (Vulpes vulpes).
  • Photo: A vulnerable European wisent (Bison bonasus) at the Madrid Zoo.
  • Photo: A cactus ferruginous pygmy owl (Glaucidium brasilianum cactorum) at Wild at Heart raptor rehabilitation center.
  • Picture of greater slow loris (Nycticebus coucang) at the Minnesota Zoo. This is a vulnerable species that's in decline due to deforestation and the pet trade.
  • A female (yellow in color) Golden Asian mantis (Hierodula venosa) at the Bugarium at the Albuquerque BioPark.
  • Picture of a striped sea cucumber (Thyonella gemmata) at Pure Aquariums from the Gulf Specimen Marine Lab.
  • Picture of a Moorish viper (Macrovipera mauritanica) at the St. Louis Zoo.
  • Photo: Pygmy goat at the Lincoln Children's Zoo.
  • Photo: Grove snail (Cepaea nemoralis) at the Trinity Western University.
  • Photo: Tulip shell (Fasciolaria tulipa), with eggs from Gulf Specimen Marine Laboratories.
  • Picture of a juvenile brown booby (Sula leucogaster) at the National Aviary breeding center.
  • Photo: A timber rattlesnake (Crotalus horridus horridus) at Reptile Gardens.
  • Photo: Japanese sparrowhawk (Accipiter gularis) at the Avilon Zoo.
  • Photo: New Granada cross-banded tree frog or masked tree frog (Smilisca phaeota) at the El Valle Amphibian Conservation Center (EVACC).
  • A blue-gray gnatcatcher (Polioptila caerulea) at Fort Hood, Texas.
  • Photo: Saddleback gunnel (Pholis ornata) at East Bay Regional Park District.
  • Photo: An unidentified butterfly on Semirara Island in the Philippines.
  • A plain pocketbook mussel (Lampsilis cardium) displays a fish-like lure used to attract fish hosts for its young. This is one of 44 species of freshwater mussels still found in the upper Mississippi River near Prairie du Chien, WI.
  • Picture of a male Maccoa duck (Oxyura maccoa) at Sylvan Heights Bird Park.
  • Photo: A Florida barred owl (Strix varia georgica) at the Jacksonville Zoo and Gardens, Jacksonville, Florida.
  • Yellow-throated plated lizard (Gerrhosaurus flavigularis) at the Omaha Zoo.
  • Photo: Red winged parrot (Aprosmictus erythropterus coccineopterus) at Loro Parque Fundacion.
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