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.冬眠是一种深度的冬季睡眠。
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Animals like bears and frogs do it to save energy.熊和青蛙等动物通过冬眠来节省能量。
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Food becomes very hard to find in cold months.寒冷月份里食物极难觅得。
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Their body temperature, heart rate, and breathing drop low.它们的体温、心率和呼吸频率都会大幅下降。
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They live on stored fat instead of eating.它们依靠储存的脂肪维生，不再进食。
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Some wake up for short times to drink or move.有些动物会短暂醒来喝水或活动。
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Not all cold animals hibernate — many just hide or migrate.并非所有冷血动物都冬眠——许多只是躲藏或迁徙。
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Hibernation helps them survive until spring returns.冬眠帮助它们存活至春天归来。