So why do dogs chase their tails?

狗为什要追巴呢？

If you said, Beaver, put your tails up.

如果你回答，海狸，请把巴翘起来。

Others like greyhounds tuck their tails.

还有些狗，比如格雷伊猎犬，它们的巴是夹起来的。

I suspect lambs can shake their tails very fast.

我猜小羊能很快速地摇动巴。

They insist on moving around and swishing their tails.

它们一直在动来动去并且甩着巴。

In Africa and Asia, monkeys’ tails are just...tails.

在非洲亚洲，猴子的巴...就只是巴。

So where are their special tails?

他们的巴怎麽不特别？

Porcupines swing their tails to stick predators with their quills.

豪猪会摇巴来使掠食者被自己的刺给粘住。

But the dogs only wagged their tails and the cats only purred.

可是，些狗只会摇巴，猫也只会发出呼噜声。

Coloured coats, curly tails and floppy ears.

不同花色的皮毛，卷曲的巴，松软的耳朵。

It's important to recognize that different breeds carry their tails at different heights.

识别狗巴摇摆的不同高型很重要。

And some lizards, like Komodo dragons, swing their flexible tails around to attack.

还有一些蜥蜴，比如说科莫多巨蜥，会摆动其灵活的巴来进行攻击。

That's why puppies tend to chase their tails more than adult dogs.

这就是为什小狗比成年狗更喜欢追逐巴的原因。

A rare group of scorpions will sometimes break off their tails to escape predators.

一群罕见的蝎子有时会折断巴以逃避捕食者。

And physically they've got thick brown fur, they've got long tails and they hop around.

外观上它们都有浓密的棕色的皮毛，它们有长长的巴，并且它们跳来跳去。

Muscular tails strike with the power of sledgehammers.

强壮的巴一击如同重锤。

With some moths they snipped the hind wing lobes and tails.

他们剪断一些飞蛾的后翅叶端。

The gas and the dust from comets form two different tails.

彗星上的气体尘埃形成了两个不同的巴。

Today, we know human embryos have tails that dissolve as the embryo develops.

今天，我们知道人胚胎的巴会随着胚胎的发育而被溶解。

They bask in the light, swishing their tails.

它们在阳光下晒着，甩着巴。