rare images - Joel Sartore

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An endangered june sucker (Chasmistes liorus) at the Loveland Living Planet Aquarium in Draper, UT.

A six-day-old Malayan tapir, Tapirus indicus, at the Minnesota Zoo. This species is listed as endangered (IUCN) and federally endangered.

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A six-day-old Malayan tapir, Tapirus indicus, at the Minnesota Zoo. This species is listed as endangered (IUCN) and federally endangered.

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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Pahu, the Bornean rhinoceros (Dicerorhinus sumatrensis harrissoni) at the Sumatran Rhino Rescue Center in Indonesia. This species is listed as critically endangered and the population is in decline.

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Pahu, the Bornean rhinoceros (Dicerorhinus sumatrensis harrissoni) at the Sumatran Rhino Rescue Center in Indonesia. This species is listed as critically endangered and the population is in decline.

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Pahu, the Bornean rhinoceros (Dicerorhinus sumatrensis harrissoni) at the Sumatran Rhino Rescue Center in Indonesia. This species is listed as critically endangered and the population is in decline.

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Pahu, the Bornean rhinoceros (Dicerorhinus sumatrensis harrissoni) at the Sumatran Rhino Rescue Center in Indonesia. This species is listed as critically endangered and the population is in decline.

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).

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.

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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 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 critically endangered and federally endangered, six-week-old female baby gorilla (Gorilla gorilla gorilla) at the Cincinnati Zoo.

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A critically endangered and federally endangered, six-week-old female baby gorilla (Gorilla gorilla gorilla) at the Cincinnati Zoo.

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 vulnerable red uakari monkey (Cacajao calvus ucayalii).

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A vulnerable red uakari monkey (Cacajao calvus ucayalii).

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Aquarium du palais de la Porte Dore. (the Porte Doree Aquarium) in Paris, France.

A critically endangered Tequila splitfin (Zoogoneticus tequila) at L’aquarium tropical du palais de la Porte Dore.

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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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An endangered Malayan elephant (Elephas maximus indicus) at Singapore Zoo.

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Endangered American burying beetles (Nicrophorus americanus) at the St. Louis Zoo.

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A critically endangered pygmy sculpin (Cottus paulus) from Auburn University fish lab.

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A critically endangered, male WaldenÕs hornbill, Rhabdotorrhinus waldeni, at Talarak Foundation.

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A critically endangered Javan green magpie (Cissa thalassina) at Taman Safari.

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A critically endangered Javan slow loris (Nycticebus javanicus) at Night Safari, part of Wildlife Reserves Singapore.

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A male and female critically endangered red-crowned roof turtle (Batagur kachuga) at the Kukrail Gharial and Turtle Rehabilitation Centre in Lucknow, Upper Pradesh, India. The male is one-third the size of the female, and there are less than 500 breeding adult animals left in the wild.