Mouth images - Joel Sartore

Picture of a federally endangered, American alligator (Alligator mississippiensis) at the Kansas City Zoo.

Photo

ANI010-00027

A federally endangered, American alligator (Alligator mississippiensis) at the Kansas City Zoo.

Photo

ANI059-00029

A hippopotamus bares its teeth at the Sedgwick County Zoo.

Nicobar pigeon, Caloenas nicobarica, at the Omaha Zoo.

Photo

BIR055-00001

Nicobar pigeon, Caloenas nicobarica, at the Omaha Zoo.

A green tree python (Morelia viridis) at the Riverside Zoo.

Photo

ANI027-00106

A green tree python (Morelia viridis) at the Riverside Zoo.

A fisher (Martes pennanti) at the New York State Zoo, Watertown, New York.

Photo

ANI062-00082

A fisher (Martes pennanti) at the New York State Zoo, Watertown, New York.

A hippopotamus (Hippopotamus amphibius) at the San Antonio Zoo. (IUCN: Vulnerable).

Photo

ANI059-00007

A hippopotamus (Hippopotamus amphibius) at the San Antonio Zoo. (IUCN: Vulnerable).

Photo

PEO024-00236

An illustration of a stream of water coming out of the mouth of a young boy.

Picture of an Eastern collared lizard (Crotaphytus collaris collaris) at the Wichita Mountains National Wildlife Refuge near Lawton, OK.

Photo

ANI073-00607

An Eastern collared lizard (Crotaphytus collaris collaris) at the Wichita Mountains National Wildlife Refuge near Lawton, OK.

Picture of a red-bellied piranha (Pygocentrus nattereri) at the Oklahoma City Zoo.

Photo

FIS011-00433

Red-bellied piranha (Pygocentrus nattereri) at the Oklahoma City Zoo.

Photo

FIS011-00434

Red-bellied piranha (Pygocentrus nattereri) at the Oklahoma City Zoo.

Photo

FIS011-00435

Red-bellied piranha (Pygocentrus nattereri) at the Oklahoma City Zoo.

Photo

FIS011-00436

Red-bellied piranha (Pygocentrus nattereri) at the Oklahoma City Zoo.

Picture of a sand cat (Felis margarita harrisoni) at the Tulsa Zoo.

Photo

ANI019-00500

A sand cat (Felis margarita harrisoni) at the Tulsa Zoo.

Photo

ANI073-00472

An American green anole or Carolina anole (Anolis carolinensis) at the Audubon Zoo in New Orleans, Louisiana.

A critically endangered and federally endangered male Western lowland gorilla (Gorilla gorilla gorilla) named Lamydoc, at the Gladys Porter Zoo in Brownsville, Texas. Lamydoc was born in 1962.

Photo

ANI053-00030

A critically endangered and federally endangered male Western lowland gorilla (Gorilla gorilla gorilla) named Lamydoc, at the Gladys Porter Zoo in Brownsville, Texas. Lamydoc was born in 1962.

Picture of common dwarf mongooses (Helogale parvula) at the Omaha Henry Doorly Zoo.

Photo

ANI035-00008

Common dwarf mongooses (Helogale parvula) at the Omaha Henry Doorly Zoo.

A female gray fox (Urocyon cinereoargenteus floridanus), This fox was taken to St. Francis Wildlife Association, a wildlife rescue center near Quincy, Florida, after it had been hit by a car.

Photo

ANI004-00091

A female gray fox (Urocyon cinereoargenteus floridanus), This fox was taken to St. Francis Wildlife Association, a wildlife rescue center near Quincy, Florida, after it had been hit by a car.

Photo

ANI004-00092

A female gray fox (Urocyon cinereoargenteus floridanus), This fox was taken to St. Francis Wildlife Association, a wildlife rescue center near Quincy, Florida, after it had been hit by a car.

Picture of a Marigold lorikeet (Trichoglossus capistratus) named Linguini at the Dallas Zoo.

Photo

BIR037-00287

A Marigold lorikeet (Trichoglossus capistratus) named Linguini at the Dallas Zoo.

A near threatened Nicobar pigeon (Caloenas nicobarica) at Omaha's Henry Doorly Zoo and Aquarium, Omaha, Nebraska.

Photo

BIR055-00026

A near threatened Nicobar pigeon (Caloenas nicobarica) at Omaha’s Henry Doorly Zoo and Aquarium, Omaha, Nebraska.

Picture of an endangered big-headed turtle (Platysternon megacephalum megacephalum) at the National Mississippi River Museum and Aquarium in Dubuque, Iowa.

Photo

ANI080-00160

An endangered big-headed turtle (Platysternon megacephalum megacephalum) at the National Mississippi River Museum and Aquarium in Dubuque, Iowa.

Photo

ANI080-00161

An endangered big-headed turtle (Platysternon megacephalum megacephalum) at the National Mississippi River Museum and Aquarium in Dubuque, Iowa.

A picture of a Southeast Asian softshelled turtle (Amyda cartilaginea cartilaginea) a vulnerable species at the National Mississippi River Museum and Aquarium in Dubuque, Iowa.

Photo

ANI080-00173

Southeast Asian softshelled turtle (Amyda cartilaginea cartilaginea) a vulnerable species at the National Mississippi River Museum and Aquarium in Dubuque, Iowa.

Photo

ANI080-00158

An endangered big-headed turtle (Platysternon megacephalum megacephalum) at the National Mississippi River Museum and Aquarium in Dubuque, Iowa.

Photo

ANI080-00159

An endangered big-headed turtle (Platysternon megacephalum megacephalum) at the National Mississippi River Museum and Aquarium in Dubuque, Iowa.

Picture of a federally endangered jaguarundi (Puma yagouaroundi) at Bear Creek Feline Center.

Photo

ANI019-00416

A federally endangered jaguarundi (Puma yagouaroundi) at Bear Creek Feline Center.

Photo

ANI019-00417

A federally endangered jaguarundi (Puma yagouaroundi) at Bear Creek Feline Center.

Photo

ANI019-00419

A federally endangered jaguarundi (Puma yagouaroundi) at Bear Creek Feline Center.

A Southern screamer (Chauna torquata) at the Kansas City Zoo.

Photo

BIR057-00052

A Southern screamer (Chauna torquata) at the Kansas City Zoo.

Picture of an endangered (IUCN) and federally endangered, 21-year-old, lion-tailed macaque (Macaca silenus) named Babu at the Cincinnati Zoo.

Photo

An endangered (IUCN) and federally endangered, 21-year-old, lion-tailed macaque (Macaca silenus) named Babu at the Cincinnati Zoo. These primates are kept in very few zoos now and are rarer in the wilds of India each year.

Photo

PEO020-00193

A teenage girl, 16, yells at the camera, Lincoln, Nebraska.

An Amur tiger (Panthera tigris altaica) at the Cheyenne Mountain Zoo. This animal is five years old, and named Grom by the zoo staff. Grom means thunder in russian. Listed as endangered (IUCN) and federally endangered.

Photo

ANI019-00379

An Amur tiger (Panthera tigris altaica) at the Cheyenne Mountain Zoo. This animal is five years old, and named Grom by the zoo staff. Grom means thunder in russian. Listed as endangered (IUCN) and federally endangered.