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Why Do Some Animals Hibernate in Winter?
为什么有些动物冬天要冬眠？
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Hibernation helps animals survive cold months when food is scarce.冬眠帮助动物在食物匮乏的寒冷月份中存活。
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Their body temperature, heart rate, and breathing all slow down greatly.它们的体温、心率和呼吸都大幅减缓。
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Fat stored in summer becomes their main energy source during sleep.夏季储存的脂肪成为冬眠期间的主要能量来源。
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Some hibernators wake up briefly to drink or move around.一些冬眠动物会短暂醒来喝水或活动。
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True hibernators like ground squirrels drop body temperature near freezing.地松鼠等真正的冬眠者体温可降至接近冰点。
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Bears sleep deeply but do not lower temperature as much as smaller animals.熊虽深度睡眠，但体温降幅不如小型动物明显。
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Hibernation is controlled by brain signals and seasonal light changes.冬眠由大脑信号和季节性光照变化调控。
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It saves energy until spring brings warmer weather and fresh food.它节省能量，直至春天带来温暖天气和新鲜食物。