Animal Jam Watch videos, play games, and meet the newest animals! Meet the Mammals! They're warm-blooded and hairy. Check out pictures, videos, and facts. Cheetah Fastest land mammal Lion SAVANNA KING KANGAROO CAN LEAP 30 FEET! River Otter LOVES TO SLIDE! Watch on YouTube! Play all the videos! Watch on Roku! Play all the videos! (AD) Buy the book! Check out the beautiful pics. Watch Nat Geo Kids on Saturday mornings! Check out these videos and more! Zany Zoo fun! Check out pics of playful animals.