The National Geographic Society funds Explorer Joel Sartore's Photo Ark project, which aims to document every species living in the world's zoos, aquariums, and wildlife sanctuaries.

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These 5 species may vanish. If they do, we’re all in trouble.

One animal purifies our water. Another provides a vital food source for three other species. This photo essay from Joel Sartore shows how saving one animal saves so many more.

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