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Featured species: A Lake Titicaca frog (Telmatobius culeus) at Denver Zoo in Denver, Colorado. To license this video, click here: Find out why this video has no sound: 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:
