National Geographic has started an ambitious project to document all 12,000 species in captivity - many of which are endangered. The Photo Ark project is led by photographer Joel Sartore, whose portraits of wildlife worth saving have been projected around the world on landmarks like the Empire State Building, UN headquarters, and even the Vatican.

Giant panda at the Zoo Atlanta. Photo / Joel Sartore for National Geographic
Giant panda at the Zoo Atlanta. Photo / Joel Sartore for National Geographic
Guianan cock of the rock at the Dallas World Aquarium. Photo / Joel Sartore for National Geographic
Guianan cock of the rock at the Dallas World Aquarium. Photo / Joel Sartore for National Geographic
American flamingos at the Lincoln Children's Zoo, Nebraska. Photo / Joel Sartore for National Geographic
American flamingos at the Lincoln Children's Zoo, Nebraska. Photo / Joel Sartore for National Geographic
Green tree python at the Riverside Discovery Centre, Nebraska. Photo / Joel Sartore for National Geographic
Green tree python at the Riverside Discovery Centre, Nebraska. Photo / Joel Sartore for National Geographic

All the images are from the April issue of

National Geographic

magazine.

Read more:
• What animal is most like you?

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Photo / National Geographic
Photo / National Geographic