The man creating an ark of photos

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Joel Sartore is an American photographer on a mission to capture images of all the animal species in zoos across the world - that's 12,000 creatures in some 40 countries. He's halfway through what he expects will be a 25 year project, called the National Geographic Photo Ark. Image and credit: © Photo by Grahm S Jones, Columbus Zoo and Aquarium; 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. Joel Sartore/National Geographic Photo Ark