Hibernation (Patterns in Nature series)
	What Is Hibernation? (Science of Living Things)
	Hibernation (Cycles of Life)
	Hibernation Survival Skills in the Animal World Cheap Chart
	Why Do Bears Sleep All Winter?: A Book About Hibernation (First Facts)
	Do Not Disturb: The Mysteries of Animal Hibernation and Sleep
	Do Polar Bears Snooze in Hollow Trees?: A Book About Animal Hibernation (Animals All Around)
	Time to Sleep (An Owlet Book)