Meet the Mammals! They're warm-blooded and hairy. Check out pictures, videos, and facts. (AD) Buy the book! Fill your brain with far-out facts. (AD) Buy the book! Check out the beautiful pics. Gibbon They're superfast! Spider Monkey They have super long tails! HOWLER MONKEY Guess how it got its name! ORANGUTAN They eat a lot of fruit! Watch on YouTube! Play all the videos! Watch Nat Geo Kids TV! Get a sneak peek of the shows. Watch this weekend! Check out Weird But True! on TV. Watch on Roku! Play all the videos!