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 These apes sing duets! Spider Monkey They have super long tails! HOWLER MONKEY Guess how it got its name! ORANGUTAN Get facts and photos. 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!