What are mammals? How are they different from other animals? How many species are there? Why are they warm-blooded? What advantages do hair and sweat offer? What's the real reason they're the dominant land animals? Why do elephants have trunks? How big is a blue whale? How does kangaroo hopping work? Find out the answers to these and many more questions in Animal's ultimate guide to mammals. Watch giant pandas live with our Giant Panda Video Cam, join big cat expert Dave Salmoni as he tries to befriend wild lions, see wolves fight off a hungry grizzly bear and much more. What are you waiting for? START EXPLORING!