Dec 17, 2015 7:00 AM

Gallery: One Man's Quest to Photograph 12,000 Species Before They Disappear

Joel Sartore/National Geographic Photo Ark
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A Mexican gray wolf (*Canis lupus baileyi*) at the Wild Canid Survival and Research Center.
Joel Sartore/National Geographic Photo Ark
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Blue poison dart frogs (Dendrobates azureus) at Reptile Gardens.
Blue poison dart frogs (*Dendrobates azureus*) at Reptile Gardens.

Joel Sartore/National Geographic Photo Ark
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An endangered Indian rhinoceros female with calf (*Rhinoceros unicornis*) at the Fort Worth Zoo.
Joel Sartore/National Geographic Photo Ark
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A Florida panther (Puma concolor coryi) at Tampa's Lowry Park Zoo.
A Florida panther (*Puma concolor coryi*) at Tampa's Lowry Park Zoo.

Joel Sartore/National Geographic Photo Ark
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An endangered, booming Attwater's Prairie Chicken (*Tympanuchus cupido attwateri*) at the Caldwell Zoo in Tyler, Texas.
Joel Sartore/National Geographic Photo Ark
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Twin three-month-old red pandas (*Ailurus fulgens fulgens*) at the Lincoln Children's Zoo.

Joel Sartore/National Geographic Photo Ark
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De Brazza's monkey (Cercopithecus neglectus)at the Omaha Zoo.
De Brazza's monkey (*Cercopithecus neglectus*) at the Omaha Zoo.
Joel Sartore/National Geographic Photo Ark
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South Georgia king penguins (*Aptenodytes patagonicus*) at the Indianapolis Zoo.

Joel Sartore/National Geographic Photo Ark
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Royal Antelope (*Neotraus pygmaeus*) at the LA Zoo. This species weighs 9-10 pounds making it the smallest of all antelopes.
Joel Sartore/National Geographic Photo Ark
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Houston Zoo
Clouded leopard (*Neofelis nebulosa*) at the Houston Zoo.

Joel Sartore/National Geographic Photo Ark
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A bald eagle (*Haliaeetus leucocephalus*) named Bensar at the George M. Sutton Avian Research Center.
Joel Sartore/National Geographic Photo Ark
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Gladys, a six-week-old western lowland gorilla (*Gorilla gorilla gorilla*) at the Cincinnati Zoo.

Joel Sartore/National Geographic Photo Ark
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A West Usambara two-horned chameleon (*Kinyongia multituberculata*) at the Houston Zoo.
Joel Sartore/National Geographic Photo Ark
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Damaraland mole rats (*Cryptomys damarensis*) at the Houston Zoo. These burrowing rodents from sub-Saharan Africa are one of only two known eusocial mammals.

Joel Sartore/National Geographic Photo Ark
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An endangered Malayan tiger (Panthera tigris jacksoni) at the Omaha Zoo.
An endangered Malayan tiger (*Panthera tigris jacksoni*) at the Omaha Zoo.
Joel Sartore/National Geographic Photo Ark
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An Indian crested porcupine (Hystrix indica) at the Omaha Zoo.
An Indian crested porcupine (*Hystrix indica*) at the Omaha Zoo.

Joel Sartore/National Geographic Photo Ark
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Omaha Zoo's Wildlife Safari Park.
An African wild cat (*Felis silvestris lybica*) at Omaha Zoo's Wildlife Safari Park.
Joel Sartore/National Geographic Photo Ark
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A male wrinkled hornbill (Aceros corrugatus) at the Houston Zoo.
A male wrinkled hornbill (*Aceros corrugatus*) at the Houston Zoo.

Joel Sartore/National Geographic Photo Ark
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An endangered baby Bornean orangutan (*Pongo pygmaeus*) named Aurora, with her adoptive mother, Cheyenne, a Bornean/Sumatran cross (*Pongo pygmaeus x abelii*) at the Houston Zoo.
Joel Sartore/National Geographic Photo Ark
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Indianapolis Zoo
African elephant (*Loxodonta africana*) at the Indianapolis Zoo.

Joel Sartore/National Geographic Photo Ark
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A flock of scarlet ibis (Eudocimus ruber) at the Caldwell Zoo in Tyler, Texas.
A flock of scarlet ibis (*Eudocimus ruber*) at the Caldwell Zoo in Tyler, Texas.
Joel Sartore/National Geographic Photo Ark
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Mandrills (Mandrillus sphinx) at the Gladys Porter Zoo in Brownsville, TX.
Mandrills (*Mandrillus sphinx*) at the Gladys Porter Zoo in Brownsville, TX.

Joel Sartore/National Geographic Photo Ark
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A frilled lizard (Chlamydosaurus kingii) at the Lincoln Children's Zoo.
A frilled lizard (*Chlamydosaurus kingii*) at the Lincoln Children's Zoo.
Joel Sartore/National Geographic Photo Ark
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Harapan, a four-year-old male Sumatran rhino (*Dicerorhinus sumatrensis*), at White Oak Conservation Center.

Joel Sartore/National Geographic Photo Ark
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A red fox (Vulpes vulpes).
A red fox (*Vulpes vulpes*).

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