Joel Sartore Joel Sartore

National Geographic Photographer and Speaker

Keyword: Two

A female slackwater darter (Etheostoma boschungi), an endangered (IUCN) and federally threatened species, at Conservation Fisheries, a native stream fish breeding center.

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A female slackwater darter (Etheostoma boschungi), an endangered (IUCN) and federally threatened species, at Conservation Fisheries, a native stream fish breeding center.

Slackwater darters (Etheostoma boschungi), an endangered (IUCN) federally threatened species, at Conservation Fisheries, a native stream fish breeding center. The male is colorful and much larger than the female.

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Slackwater darters (Etheostoma boschungi), an endangered (IUCN) federally threatened species, at Conservation Fisheries, a native stream fish breeding center. The male is colorful and much larger than the female.

Slackwater darters (Etheostoma boschungi), an endangered (IUCN) federally threatened species, at Conservation Fisheries, a native stream fish breeding center. The male is colorful and much larger than the female.

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Slackwater darters (Etheostoma boschungi), an endangered (IUCN) federally threatened species, at Conservation Fisheries, a native stream fish breeding center. The male is colorful and much larger than the female.

Vulnerable (IUCN) citico darters (Etheostoma sitikuense) at Conservation Fisheries, a native stream fish breeding center.

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Vulnerable (IUCN) citico darters (Etheostoma sitikuense) at Conservation Fisheries, a native stream fish breeding center.

Relict darters (Etheostoma chienense) a federally threatened species at Conservation Fisheries, a native stream fish breeding center.

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Relict darters (Etheostoma chienense) a federally threatened species at Conservation Fisheries, a native stream fish breeding center.

Slackwater darters (Etheostoma boschungi), an endangered (IUCN) federally threatened species, at Conservation Fisheries, a native stream fish breeding center. The male is colorful and much larger than the female.

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Slackwater darters (Etheostoma boschungi), an endangered (IUCN) federally threatened species, at Conservation Fisheries, a native stream fish breeding center. The male is colorful and much larger than the female.

Vulnerable (IUCN) and federally endangered boulder darters (Etheostoma wapiti) at Conservation Fisheries, a native stream fish breeding center.

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Vulnerable (IUCN) and federally endangered boulder darters (Etheostoma wapiti) at Conservation Fisheries, a native stream fish breeding center.

Vulnerable (IUCN) and federally endangered boulder darters (Etheostoma wapiti) at Conservation Fisheries, a native stream fish breeding center.

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Vulnerable (IUCN) and federally endangered boulder darters (Etheostoma wapiti) at Conservation Fisheries, a native stream fish breeding center.

A pair of ox beetles (Strategus aloeus) at the Audubon Zoo in New Orleans.

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A pair of ox beetles (Strategus aloeus) at the Audubon Zoo in New Orleans.

Spotted-necked otters (Hydrictis maculicollis) at the Omaha Zoo.

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Spotted-necked otters (Hydrictis maculicollis) at the Omaha Zoo.

Spotted-necked otters (Hydrictis maculicollis) at the Omaha Zoo.

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Spotted-necked otters (Hydrictis maculicollis) at the Omaha Zoo.

Spotted-necked otters (Hydrictis maculicollis) at the Omaha Zoo.

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Spotted-necked otters (Hydrictis maculicollis) at the Omaha Zoo.

Vulnerable (IUCN) and federally endangered mandrills (Mandrillus sphinx) at the Gladys Porter Zoo in Brownsville, TX.

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Vulnerable (IUCN) and federally endangered mandrills (Mandrillus sphinx) at the Gladys Porter Zoo in Brownsville, TX.

A pair of vulnerable 1-year-old fossas, Cryptoprocta ferox, at the Omaha Zoo. This is Madagascar's largest mammalian predator, and it's numbers are declining in the wild.

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A pair of vulnerable 1-year-old fossas, Cryptoprocta ferox, at the Omaha Zoo. This is Madagascar’s largest mammalian predator, and it’s numbers are declining in the wild.

Photo: A pair of guinea pigs at the Capital Humane Society in Lincoln.

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A pair of guinea pigs at the Capital Humane Society in Lincoln.

Photo: A pair of guinea pigs at the Capital Humane Society in Lincoln.

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A pair of guinea pigs at the Capital Humane Society in Lincoln.

Endangered Golden lion tamarins (Leontopithecus rosalia) at the Lincoln Children's Zoo.

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Endangered Golden lion tamarins (Leontopithecus rosalia) at the Lincoln Children’s Zoo.

Endangered Golden lion tamarins (Leontopithecus rosalia) at the Lincoln Children's Zoo.

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Endangered Golden lion tamarins (Leontopithecus rosalia) at the Lincoln Children’s Zoo.

Endangered Golden lion tamarins (Leontopithecus rosalia) at the Lincoln Children's Zoo.

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Endangered Golden lion tamarins (Leontopithecus rosalia) at the Lincoln Children’s Zoo.

Ring-tailed lemurs (Lemur catta) at the Lincoln Children's Zoo.

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Ring-tailed lemurs (Lemur catta) at the Lincoln Children’s Zoo.

Ring-tailed lemurs (Lemur catta) at the Lincoln Children's Zoo.

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Ring-tailed lemurs (Lemur catta) at the Lincoln Children’s Zoo.

Domestic rabbits (Oryctolagus cuniculus) that are up for adoption at the Capital Humane Society.

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Domestic rabbits (Oryctolagus cuniculus) that are up for adoption at the Capital Humane Society.

Domestic rabbits (Oryctolagus cuniculus) that are up for adoption at the Capital Humane Society.

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Domestic rabbits (Oryctolagus cuniculus) that are up for adoption at the Capital Humane Society.

Picture of critically endangered (IUCN) and federally endangered Edward's pheasants (Lophura edwardsi) at the Sunset Zoo.

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Critically endangered (IUCN) and federally endangered Edward’s pheasants (Lophura edwardsi) at the Sunset Zoo. The male has the color, while the hen is brown. This bird is so rare it’s now nearly gone in the wild. Zoos play a critical role as modern day arks, preserving species that would otherwise be lost to extinction.

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'.

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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’.

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'.

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ESA002-00135

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’.

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'.

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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’.

An endangered (IUCN) and federally endangered African wild dog (Lycaon pictus)

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An endangered (IUCN) and federally endangered African wild dog (Lycaon pictus)

An endangered (IUCN) and federally endangered African wild dog (Lycaon pictus)

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An endangered (IUCN) and federally endangered African wild dog (Lycaon pictus)

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'.

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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’.

Picture of critically endangered (IUCN) and federally endangered Edward's pheasants at the Sunset Zoo in Manhattan, KS.

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Critically endangered (IUCN) and federally endangered Edward’s pheasants (Lophura edwardsi) at the Sunset Zoo. The male has the color, while the hen is brown. This bird is so rare it’s now nearly gone in the wild. Zoos play a critical role as modern day arks, preserving species that would otherwise be lost to extinction.

Australian walking sticks (Extatosoma tiaratum) in two colors at the National Aquarium, Baltimore.

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Australian walking sticks (Extatosoma tiaratum) in two colors at the National Aquarium, Baltimore.

Spotted hyenas (Crocuta crocuta) trash a background in 30 seconds.

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Spotted hyenas (Crocuta crocuta) trash a background in 30 seconds.

Micronesian kingfishers (Todiramphus cinnamominus) at the Houston Zoo. This species is considered Extinct in the Wild by IUCN.

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Micronesian kingfishers (Todiramphus cinnamominus) at the Houston Zoo. This species is considered Extinct in the Wild by IUCN.

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