Back images - Joel Sartore

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A giant canyon isopod (Porcellio dilatatus) at Josh’s Frogs in Owosso, Michigan.

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A giant canyon isopod (Porcellio dilatatus) at Josh’s Frogs in Owosso, Michigan.

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A critically endangered (IUCN) and federally endangered four-year-old male Sumatran rhino (Dicerorhinus sumatrensis sumatrensis) named Harapan at White Oak Conservation Center.

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Brazilian horned frog (Ceratophrys aurita) from a private collection.

Picture of a Western king wrasse (Coris auricularis) at Omaha's Henry Doorly Zoo and Aquarium.

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Western king wrasse (Coris auricularis) at Omaha’s Henry Doorly Zoo and Aquarium.

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A zig-zag spider (Neoscona cooksoni) on North Seymour, in Galapagos National Park. The zig-zag is a species endemic to the Galapagos.

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Silkie showgirl chickens at the Fort Worth Zoo. These are domestic animals, used for education here.

Texas horned toad (Phrynosoma cornutum) at the Fort Worth Zoo.

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Texas horned toad (Phrynosoma cornutum) at the Fort Worth Zoo.

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Joel on assignment photographing the federally endangered Iowa Pleistocene snail (Discus macclintocki).

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A Humboldt penguin at the Great Plains Zoo. (IUCN: Vulnerable)

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A Humboldt penguin at the Great Plains Zoo. (IUCN: Vulnerable)

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A Humboldt penguin at the Great Plains Zoo. (IUCN: Vulnerable)

A diamondback water snake (Nerodia rhombifer blanchardi) at the Chapultepec Zoo, Mexico City, Mexico.

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A diamondback water snake (Nerodia rhombifer blanchardi) at the Chapultepec Zoo, Mexico City, Mexico.

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A diamondback water snake (Nerodia rhombifer blanchardi) at the Chapultepec Zoo, Mexico City, Mexico.

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A diamondback water snake (Nerodia rhombifer blanchardi) at the Chapultepec Zoo, Mexico City, Mexico.

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A diamondback water snake (Nerodia rhombifer blanchardi) at the Chapultepec Zoo, Mexico City, Mexico.

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A diamondback water snake (Nerodia rhombifer blanchardi) at the Chapultepec Zoo, Mexico City, Mexico.

A Texas tortoise (Gopherus berlandieri) at the Houston Zoo.

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A Texas tortoise (Gopherus berlandieri) at the Houston Zoo.

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A Texas tortoise (Gopherus berlandieri) at the Houston Zoo.

A picture of a critically endangered (IUCN) and federally endangered Houston toad (Anaxyrus houstonensis) at the San Antonio Zoo in Texas.

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A critically endangered (IUCN) and federally endangered Houston toad (Anaxyrus houstonensis) at the San Antonio Zoo in Texas.

An aboreal alligator lizard (Abronia graminea) at the San Antonio Zoo. (IUCN: Endangered)

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An aboreal alligator lizard (Abronia graminea) at the San Antonio Zoo. (IUCN: Endangered)

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An aboreal alligator lizard (Abronia graminea) at the San Antonio Zoo. (IUCN: Endangered)

Picture of a vulnerable (IUCN) and federally endangered Attwater's prairie chicken (Tympanuchus cupido attwateri), also known as the greater prairie chicken, at the San Antonio Zoo.

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A vulnerable (IUCN) and federally endangered Attwater’s prairie chicken (Tympanuchus cupido attwateri), also known as the greater prairie chicken, at the San Antonio Zoo.