Zzzzzz. Oh, hi — we were just hibernating! You probably know that lots of animals hibernate during the winter. But do you know why they do it? Or what they need to do to insure that they have enough food for those winter months? In this BrainPOP movie on hibernation, Tim and Moby will tell you why most hibernating animals are much smaller than bears — and why many scientists don’t believe that bears hibernate at all! You’ll learn about the role that stored fat plays in hibernation, and just what happens during those long winter months for hibernating animals. This is one movie you won’t want to sleep through!