From sleep cycles to hibernation, light regulates most of life on Earth.

不论是睡眠周期还是眠，光调节着地球上大部分生命活动规律。

Which of these animals hibernates in winter?

以下哪种动物会眠？

It's particularly found in animals that hibernate - the ones that sleep during the winter.

这种现象眠动物身上尤其常见，眠动物是那些只睡觉动物。

Aristotle's second and even more enduring hypothesis was that birds hibernate.

鸟类会眠。

They're furry, fat and hibernate all winter. Not bears - bumblebees.

它们毛、胖胖，整个都眠。

Giant tortoises, however, can't burrow. And they sleep above ground.

然而，巨型陆龟却没有挖掘。他们地上眠。

Go into hibernation for a little bit. And just sleep it out.

进入眠。直接睡过去。

Hibernation is a state often compared to sleep.

眠这种状态通常被拿来与睡眠相比。

During hibernation, they breathe through their skins, not their mouths.

眠期间，它们通过皮肤而不是嘴巴来呼吸。

If they are disturbed during hibernation, they can get up very quickly.

如果它们眠时被吵醒，它们很快地爬起来。

Harbiners, people from Harbin, do not hibernate during the winter.

哈尔滨人可不会眠。

Sculptures forced into hibernation in this renaissance palace.

这座文艺复兴时期宫殿里，雕塑们也被迫进入眠。

Seeing it as getting my little burrow ready for a period of hibernation.

把它看作是让我小洞穴为眠做好准备。

Most of the animals here are either hibernating or have migrated south for the winter.

这里大部分动物不是眠，就是往南方迁移过了。

Unlike other bears, the panda can't fatten itself up and hibernate through the winter.

不像其他熊类，熊猫无法通过吃胖后眠来度过。

Well, we gotta get ready for hibernation somehow! Eating a lot is definitely a requirement!

我们得为眠做好准备呀！大吃特吃可是必要条件！

Many insects, plants and even some animals are coming out of a deep, deep sleep.

许多昆虫、植物还有动物也正从眠中苏醒过来。

What type of bears do not spend their winters hibernating?

什么种类熊不会眠呢?

Last year hibernating butterflies covered 35 percent more forest than the year before.

去年眠蝴蝶覆盖森林面积比前年增加了35%。

Some monarchs fly more than 2000 miles to hibernate.

一些黑脉金斑蝶要飞行2000多英里才眠。