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A bat (Northern bat) hibernating in Norway

Hibernation is a time of inactivity. Some endothermic (warm-blooded) animals hibernate, usually during the winter, when food is short. They fall into a sleep-like state. They regulate their metabolism to consume less energy. They lower their body temperature, slow their breathing, and slow other vital functions. During hibernation, the body uses fat for energy, which the animal has gathered in summer and autumn.

Mammals like bats, ground squirrels (like marmots), hedgehogs, marsupials and others hibernate.

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