Hello Norman!

Norman is awake!
YIPEEEE!!!! Our school pet, Norman the tortoise, has woken up from his long winter sleep! Spring must be on its way!
What is it called when animals sleep for the winter? How many other animals can you think of that sleep through the winter?
First 5 children to bring me their answers will win a prize! Bonus prize for anyone who creates a fact file about a tortoise!