studio images - Joel Sartore

A Columbia spotted frog (Rana luteiventris) from the Toiyabe subpopulation near Austin, Nevada.

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A Columbia spotted frog (Rana luteiventris) from the Toiyabe subpopulation near Austin, Nevada.

A Northern leopard frog (Lithobates pipiens) at Cross Lake, Minnesota.

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A Northern leopard frog (Lithobates pipiens) at Cross Lake, Minnesota.

An endangered Malayan tiger (Panthera tigris jacksoni) at the Omaha Zoo.

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An endangered Malayan tiger (Panthera tigris jacksoni) at the Omaha Zoo.

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A southern three-banded armadillo (Tolypeutes matacus) at the Lincoln Children’s Zoo.

A bog turtle (Glyptemys muhlenbergii) an endangered (IUCN) and federally threatened species at the Atlanta Zoo.

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A bog turtle (Glyptemys muhlenbergii) an endangered (IUCN) and federally threatened species at the Atlanta Zoo.

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A vulnerable Parker’s snake-necked turtle (Chelodina parkeri).

Nicobar pigeon, Caloenas nicobarica, at the Omaha Zoo.

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Nicobar pigeon, Caloenas nicobarica, at the Omaha Zoo.

A sunbittern (Eurypyga helias ) at the Cincinnati Zoo.

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A sunbittern (Eurypyga helias ) at the Cincinnati Zoo.

The critically-endangered orange-bellied parrot (Neophema chrysogaster) at the Healesville Wildlife Sanctuary. This is one of the rarest birds in the world with fewer than 50 left in the wild.

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The critically-endangered orange-bellied parrot (Neophema chrysogaster) at the Healesville Wildlife Sanctuary. This is one of the rarest birds in the world with fewer than 50 left in the wild.

A young female snowy owl (Bubo scandiacus).

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A young female snowy owl (Bubo scandiacus).

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Two koala joeys (Phascolarctos cinereus) cling to each other, waiting to be placed with human caregivers at the Australia Zoo Wildlife Hospital in Queensland. Once they’re old enough, they’ll be released into the wild.

A fruit bat (Lissonycteris angolensis) hanging with wings folded, from Bioko Island, Equatorial Guinea.

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A fruit bat (Lissonycteris angolensis) hanging with wings folded, from Bioko Island, Equatorial Guinea.

A critically endangered sumatran orangutan, Pongo abelii, at the Gladys Porter Zoo in Brownsville, TX.

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A critically endangered sumatran orangutan, Pongo abelii, at the Gladys Porter Zoo in Brownsville, TX.

A giant panda (Ailuropoda melanoleuca) at Zoo Atlanta. This endangered (IUCN) and federally endangered species is native to China.

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A giant panda (Ailuropoda melanoleuca) at Zoo Atlanta. This endangered (IUCN) and federally endangered species is native to China.

A vulnerable reticulated giraffe (Giraffa camelopardalis reticulata) at Rolling Hills Wildlife Adventure near Salina, Kansas.

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A vulnerable reticulated giraffe (Giraffa camelopardalis reticulata) at Rolling Hills Wildlife Adventure near Salina, Kansas.

Picture of a vulnerable red collared brown lemur (Eulemur collaris) at the Omaha Zoo.

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vulnerable red collared brown lemur (Eulemur collaris) at the Omaha Zoo.

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

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

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An endangered Grevy’s zebra (Equus grevyi) at the Lee G. Simmons Conservation Park and Wildlife Safari.

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

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Zoologico De Cali This specimen came from the northern part of Colombia.

Columbian wood turtle (Rhinoclemmys melanosterna) at the Cali Zoo.

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Cincinnati Zoo

A vulnerable banded palm civet (Hemigalus derbyanus) named Yala at the Cincinnati Zoo. Yala means “go” in Arabic, the keepers said, which is appropriate because this creature moved like greased lighting. He is the last of his kind in North American zoos.