No mammal except man has more abundant cerebral matter.

任何哺乳都没有这样丰富的脑髓神经。

Mammals are the group of animals that humans belong to!

人属于哺乳！

The percentages are very different for different groups of mammals.

不同哺乳群体的比例差异也很大。

The last group of animals we are going to talk about is mammals.

我们将要讲的最后一群是哺乳。

But some scientists think mammals also have this capability.

但有些科学家认为哺乳也有这种能力。

And as they get older they transition to feeding more on mammals.

当它们越来越大，就要转为喂它们多的哺乳。

We see similar hygiene-driven responses in some colony-living mammals.

在一些群居活的哺乳身上也会看到出于卫的反应。

In most mammals, the placenta is confined behind a barrier of maternal cells.

大多数哺乳的胎盘 被母亲体内的一层细胞屏障围着。

If we hunted all of the world’s wild mammals and birds they’d get us by for a few days.

猎食所有哺乳和鸟，可以再多几天。

Because mammalian predators that stay below that number can exist on prey smaller than them.

因为体重在20公斤以下的哺乳能以追捕体型小的猎为。

Most mammals live on land but some such as whales and dolphins live in water.

大多数的哺乳活在陆地上，例如鲸和海豚活在水中。

In come amphibians, reptiles, dinosaurs and finally, mammals.

接下来就是会出现两栖，爬行，恐龙，最后是哺乳。

It's a tree-dwelling mammal about the size of a raccoon that's native to Southeast Asia.

这种产于东南亚地区在树上活的哺乳，体型和浣熊相当。

Killing mammals was either just collateral damage or a form of protection against possible predators.

杀死哺乳要么只是一种附带损伤，要么是一种防御潜在捕食者的形式。

Like birds, mammals are warm-blooded and breathe air.

和鸟一样，哺乳是恒温，呼吸空气。

You find it associated with play, and all mammals play.

你会发现笑是在玩耍中发的， 而所有的哺乳都会玩耍。

The small mammals and the larger mammals just can't survive for that length of time on inundated islands.

大型或小型哺乳都不能在淹没的岛上存那么长的时间。

In fact, the short-faced bear is probably the largest and most powerful mammalian carnivore that we have.

其实，短面熊有可能是有史以来最大、最有力的哺乳食肉。

They are mammals, which means they are warm-blooded, they have fur, and they feed their babies milk.

它们是温血的哺乳，长颈鹿表面有毛，用母乳喂养幼崽。

Small mammals are such an important part of the ecosystem for transporting seeds into different areas.

小型哺乳是态系统中重要的一环，它们能把种子送往不同的地方。