动物在寒冷的冬天有三种主要的生存方式：休眠、适应或迁徙。
There are three main ways that animals survive the cold in winter: sleep, adapt or migrate.
一些两栖动物通过在地下深处的休眠期内完成加速发育以适应干旱环境。
Some amphibians adapt to arid environments by completing accelerated development with resting stages deep underground.
南加利福尼亚的地松鼠既冬眠也夏眠。这种小动物在七月份就开始休眠了，有时会休眠到来年春天。
The ground squirrel of southern california both estivates and hibernates . this kind of little animals begin resting in july and sometimes remain this way until the following spring.
南加利福尼亚的地松鼠既冬眠也夏眠。这种小动物在七月份就开始休眠了，有时会休眠到来年春天。
The ground squirrel of southern california both estivates and hibernates . this kind of little animals begin resting in july and sometimes remain this way until the following spring.
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