Match the animal to its eye! Play Photo Ark Memory. 5 Funniest "Animal Ark" Faces (AD) Buy the book! Check out the beautiful pics. Sloth They sleep up to 20 hours a day! Fred Hiebert ARCHAEOLOGIST Sea Queen Oceanographer Dr. Sylvia Earle CHIMPANZEE They're our closest living relatives. Watch more videos! Visit Nat Geo Kids on YouTube. Cool Videos! Watch playlists on YouTube. Watch wild animals. More Explorer Academy Play all the videos!