In winter, the weather gets colder. There is snow on the ground. People live in warm houses and wear heavy coats outside. But what happen to the animals?

冬天，天氣轉(zhuǎn)冷，雪覆蓋了大地。人們呆在溫暖的房子里，出門也穿上了厚重的外衣。但是動(dòng)物又會(huì)怎樣呢?

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Some animals sleep all winter. It is a very deep sleep called hibernation (冬眠). The animals’ body temperature drops, and its heartbeat and breathing slow down. These animals get ready for winter by eating extra food and storing it as body fat (脂肪). They need little or no food while hibernating. Bears and chipmunks （金花鼠） hibernate. So do frogs, snakes and even some bugs.

Tip: 動(dòng)物越冬的方式之一為冬眠。當(dāng)動(dòng)物冬眠的時(shí)候，體溫降低，心跳和呼吸也減慢。有的動(dòng)物幾乎整個(gè)冬天都處于睡眠狀態(tài)，只消耗體內(nèi)貯存的脂肪來補(bǔ)充能量；而有的動(dòng)物則會(huì)中間醒來吃些秋天貯備的食物。
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Some birds fly south for the winter. We call this migration. Some of them travel in large flocks. For example, geese fly in noisy, “V”-shaped groups. Other kinds of birds fly alone. They go to a warmer place to find food. Other birds stay here all winter. We can help by feeding them. Besides, some fish and a few mammals (哺乳動(dòng)物) migrate too, like some bats and whales.

Tip: 動(dòng)物越冬的方式之二為遷徙。這種行為在鳥類中居多。它們通常會(huì)成群結(jié)隊(duì)地飛往南方過冬，如大雁。此外，一些魚和哺乳動(dòng)物也會(huì)在冬天到來的時(shí)候進(jìn)行遷徙。如一些蝙蝠和鯨類。

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Other animals stay active in winter. They must adapt (適應(yīng)) to the changing weather. It is hard for them to find food. They gather extra food in the fall and store it to eat later. To keep warm, some animals may grow new, thicker fur in the fall and live in holes in trees or under the ground in the winter. Deer, squirrels and rabbits stay active.

Tip: 另外還有些動(dòng)物必須要適應(yīng)天氣的變化。它們會(huì)提前貯備食物，有的會(huì)長(zhǎng)出又厚又長(zhǎng)的毛或者干脆就躲在樹洞中和地下保暖。如鹿、松鼠，兔等。
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