10 captivating images from National Geographic's Photo Ark

Since 2006, the project has photographed 17,000 species in the world's zoos, aquariums, and wildlife sanctuaries. Photographs from the Photo Ark will be featured in the inaugural exhibition at the National Geographic Museum of Exploration in Washington D.C. Breakthroughs, discoveries, and DIY tips sent every weekday. A picture is said to be worth a thousand words, but some photographs are worth 17,000. Well, 17,000 species, that is. For's Photo Ark project, photographer Joel Sartore is documenting all species living in the world's zoos, aquariums, and wildlife sanctuaries.