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Neofelis nebulosa (on Homo sapiens)
After a photo shoot at the Columbus Zoo in Ohio, a clouded leopard cub climbs on Sartore’s head. The leopards, which live in Asian tropical forests, are illegally hunted for their spotted pelts.
Grahm S. Jones, Columbus Zoo and Aquarium
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Canis rufus gregoryi
A pair of red wolves at the Great Plains Zoo. Red wolves offer an example of what conservation efforts, and laws like the Endangered Species Act, can achieve. Though the species is still endangered, rehabilitation efforts beginning in 1967 pulled red wolves back from the brink of extinction.
© Joel Sartore/National Geographic Photo Ark
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Propithecus coquereli
A Coquerel's sifaka at the Houston Zoo. The endangered Coquerel's sifaka is a type of lemur native to Madagascar and now found only in two protected areas of northwestern Madagascar.
© Joel Sartore/National Geographic Photo Ark
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Phascolarctos cinereus
A federally threatened koala with her babies at the Australia Zoo Wildlife Hospital. Stuffed "koala bear" toys are misnamed: Koalas are actually marsupials, not bears, and their name is thought to be an Aboriginal reference ("no drink") to the fact that they don't need much water.
© Joel Sartore/National Geographic Photo Ark
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Rhinopithecus roxellana
Two Golden snub-nosed monkeys at Ocean Park Hong Kong. A recent study found that mothers in this vulnerable species will nurse each other's babies, which may help overall survival.
© Joel Sartore/National Geographic Photo Ark
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Panthera tigris jacksoni
An endangered Malayan tiger at Omaha Henry Doorly Zoo. Found only on the Malay Peninsula and parts of Thailand, the species was listed as critically endangered by the International Union for Conservation of Nature (IUCN) in 2015.
© Joel Sartore/National Geographic Photo Ark
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Puma concolor coryi
A federally endangered Florida panther at Tampa's Lowry Park Zoo. The only puma known to exist east of the Mississippi, Florida panthers keep populations of other species, such as feral hogs and deer, in check.
© Joel Sartore/National Geographic Photo Ark
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Nycticebus pygmaeus
A pygmy slow loris at Omaha's Henry Doorly Zoo and Aquarium. Though they look cute and harmless, lorises are the only venomous primates in the world.
© Joel Sartore/National Geographic Photo Ark
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Gyps africanus
A critically endangered African white-backed vulture at the Cleveland Metroparks Zoo. Surviving on carrion, vultures perform nature's cleanup and recycling duties, which can help prevent the spread of bacteria and disease.
© Joel Sartore/National Geographic Photo Ark
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Pongo pygmaeus and Pongo pygmaeus x abelii
An endangered baby Bornean orangutan, named Aurora, with her adoptive mother, Cheyenne, a Bornean/Sumatran cross, at the Houston Zoo. Palm plantations and other habitat destruction have decimated populations of orangutans, which spend their entire lives up in trees.
© Joel Sartore/National Geographic Photo Ark
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Brachylophus fasciatus
A Fiji Island banded iguana at the Los Angeles Zoo. Found only on the Fiji Islands, these colorful lizards have suffered habitat loss from mining, logging and other land use changes.
© Joel Sartore/National Geographic Photo Ark
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Geochelone platynota
Three critically endangered, yearling Burmese star tortoises at the Turtle Conservancy. Hunted for their beautiful shells, their populations have been reduced to fewer than 5,000 worldwide.
© Joel Sartore/National Geographic Photo Ark
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The Photographer
A portrait of Joel Sartore, a National Geographic Fellow and regular contributor to National Geographic magazine, taken in Lincoln, Nebraska. "When we save species, we’re actually saving ourselves," he says.
COLE SARTORE