十万个为什么·科学阅读30篇（5）
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Why Do Some Animals Hibernate?
为什么有些动物要冬眠？
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Winter brings cold weather and less food for many animals.冬天带来寒冷天气，许多动物的食物也变少了。
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Hibernation is a deep sleep that saves energy and heat.冬眠是一种深度睡眠，能节省能量和热量。
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Heart rate and breathing slow down a lot during hibernation.冬眠期间，心率和呼吸大幅减慢。
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Body temperature drops close to freezing in some species.某些物种的体温会降至接近冰点。
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Bears, bats, and ground squirrels all hibernate in different ways.熊、蝙蝠和地松鼠以不同方式冬眠。
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Some wake up every few weeks to eat or move around.有些动物每隔几周醒来进食或活动。
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Others stay asleep for months without eating at all.另一些则连续数月沉睡，完全不进食。
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When spring comes, they wake up hungry and active again.春天来临时，它们又饿又活跃地醒来。