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Some animals hibernate over the winter, going into a very deep sleep.
Hibernating animals usually retreat to a den, a burrow, or a hollow log for protection and shelter. During hibernation, the animal's body temperature drops, and its rate of breathing slows down. Hibernating animals are very difficult to awaken. Most animals will eat large amounts of food before hibernating, adding body fat that will nourish them during the winter. Occasionally, hibernating animals will awaken periodically during the winter to eat.