http://nationalgeographic.org/projects/photo-ark/

National Geographic

has started an ambitious project to document all 12,000 species in captivity - many of which are endangered.

, 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.

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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.

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