十万个为什么·科学阅读30篇（3）
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Why Do Some Animals Hibernate?
有些动物为什么会冬眠？
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Hibernation is a deep winter sleep.
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Animals like bears and frogs do it to save energy.
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Food becomes very hard to find in cold months.
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Their body temperature, heart rate, and breathing drop low.
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They live on stored fat instead of eating.
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Some wake up for short times to drink or move.
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Not all cold animals hibernate — many just hide or migrate.
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Hibernation helps them survive until spring returns.