Many of the animals in these galleries are threatened with extinction, and unfortunately, a lot of threats come from humans. Check out these creatures that were photographed by National Geographic photographer Joel Sartore at zoos and other safe places around the world. Then find out how you can help.
A three-month-old chimpanzee photographed at Tampa's Lowry Park Zoo in Florida
A three-month-old chimpanzee photographed at Tampa's Lowry Park Zoo in Florida
A koala with her baby photographed at Australia Zoo Wildlife Hospital in Australia
A koala with her baby photographed at Australia Zoo Wildlife Hospital in Australia
A critically endangered Sumatran tiger, Panthera tigris sumatrae, at the Miller Park Zoo. A critically endangered Sumatran tiger, Panthera tigris sumatrae, at the Miller Park Zoo. A critically endangered Sumatran tiger, Panthera tigris sumatrae, at the Miller Park Zoo.
A critically endangered Sumatran tiger, Panthera tigris sumatrae, at the Miller Park Zoo. A critically endangered Sumatran tiger, Panthera tigris sumatrae, at the Miller Park Zoo. A critically endangered Sumatran tiger, Panthera tigris sumatrae, at the Miller Park Zoo.
A blue-throated macaw photographed at the Houston Zoo in Texas
A blue-throated macaw photographed at the Houston Zoo in Texas
A northern white cheeked gibbon photographed at the Endangered Primate Rescue Center in Vietnam
A northern white cheeked gibbon photographed at the Endangered Primate Rescue Center in Vietnam