修改时间：2021-05-20 浏览次数：101 类型：同步测试
Winter is very cold in many countries. It's easy for you and me to keep warm. If we are cold, we can just buy a warm coat or use a heater and we will feel better. But what about animals? How do they keep warm in winter?
Some animals migrate(迁徙). This means they travel to places where the weather is warmer. Many birds leave before the winter starts. They fly in groups. If they fly together, the trip will be safer. They like to migrate to the same place every year. Do you know how they can find the same place？Scientists say that birds use the sun, the moon and stars to help them. Other animals like moose (麋鹿) also migrate. Fish and whales swim to warmer water.
Some animals don't have to leave their homes. They hibernate(冬眠) in winter. They fall into a very deep sleep. The animals' temperature drops and their breathing slows down. Before the winter, these animals must eat much food. If they don't eat enough, they may die while they are hibernating.
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