Hibernation worksheets and printables for young learners. A form of adaptation for the winter is called hibernation. Animals that hibernate will go into what many refer to as a deep sleep over the cold winter months. There is often very little food for these animals therefore they stock up on food before hibernation and live off of the store fat. They will burrow into the ground, go into nests or dens and sleep for the months of winter. Their heartbeat slows down as does the breathing.