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Western purple-faced langur (Trachypithecus velustus nestor) at the Singapore Zoo.

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Western purple-faced langur (Trachypithecus velustus nestor) at the Singapore Zoo.

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Western purple-faced langur (Trachypithecus velustus nestor) at the Singapore Zoo.

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Western purple-faced langur (Trachypithecus velustus nestor) at the Singapore Zoo.

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A critically endangered, male Sumatran orangutan, Pongo pygmaeus abelii, at Rolling Hills Wildlife Adventure.

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A critically endangered, male Sumatran orangutan, Pongo pygmaeus abelii, at Rolling Hills Wildlife Adventure.

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Two koala joeys cling to each other, waiting to be placed with human caregivers. once they’re old enough, they’ll be released into the wild.

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A vulnerable Olympic torrent salamander (Rhyacotriton olympicus) at the Sedgwick County Zoo in Wichita, Kansas.

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An endangered Okinawa newt (Cynops ensicauda popei) at the Sedgwick County Zoo in Wichita, Kansas.

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A critically endangered peacock parachute spider (Poecilotheria metallica) at the Sedgwick County Zoo in Wichita, Kansas.

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A critically endangered pygmy hog (Porcula salvania) at the Pygmy Hog Breeding Center in India. This is one of the rarest mammals in the world, and was thought to be extinct until just a few years ago.

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A critically endangered pygmy hog (Porcula salvania) at the Pygmy Hog Breeding Center in India. This is one of the rarest mammals in the world, and was thought to be extinct until just a few years ago.

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Critically endangered pygmy hogs (Porcula salvania) at the Pygmy Hog Breeding Center in India. This is one of the rarest mammals in the world, and was thought to be extinct until just a few years ago.

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A Lord Howe Island stick insect (Dryococelus australis) at the Melbourne Zoo.

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An endangered Calamian deer (Hyelaphus calamianensis) at the LA Zoo.

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An endangered Calamian deer (Hyelaphus calamianensis) at the LA Zoo.

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Endangered Calamian deer (Hyelaphus calamianensis) at the LA Zoo.

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An endangered Calamian deer (Hyelaphus calamianensis) at the LA Zoo.

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An endangered Calamian deer (Hyelaphus calamianensis) at the LA Zoo.

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Five-month-old mountain tapir (Tapirus pinchaque) at the Cali Zoo in Colombia.

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Five-month-old mountain tapir (Tapirus pinchaque) at the Cali Zoo in Colombia.

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A white-lipped mud turtle (Kinosternon leucostomum) at the Cali Zoo in Colombia.

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A white-lipped mud turtle (Kinosternon leucostomum) at the Cali Zoo in Colombia.

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Southern corroboree frog (Pseudophryne corroboree) a critically endangered species at the Healesville Wildlife Sanctuary in Melbourne, Australia.

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Chaco side-necked turtle (Acanthochelys pallidipectoris) at the Tulsa Zoo.

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Chaco side-necked turtle (Acanthochelys pallidipectoris) at the Tulsa Zoo.

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