As a photographer, Joel Sartore traveled all over the world taking pictures for outlets like National Geographic, but he wanted to really accomplish something with his work.
While taking pictures of the animals at his local zoo, Sartore had an idea: by taking a portrait of every animal in captivity, he could make a modern "Noah's ark" that would preserve them forever.
It's a huge project, but since 2007 Joel has photographed more than half of the 12,000 species in captivity. He hopes the stunning pictures he takes will inspire people to do more to help protect endangered species.
Click the next page to see more of Joel's amazing photos!