Featured species: A Chinese blind cave fish (Sinocyclocheilus furcordorsalis) at Aquarium Berlin.
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The National Geographic Photo Ark, led by photographer Joel Sartore, is a multiyear effort to document every species living in zoos and wildlife sanctuaries, inspire action through education, and help save wildlife by supporting on-the-ground conservation efforts.
Explore the thousands of photos and videos in the Ark to find out more about wildlife around the world and the threats they face in the wild:
Instagram: @joelsartore
Facebook: @sartorephoto
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