The kelp forest is more than just a home for underwater animals.

海草林并不只是水生动的家园。

They are semiaquatic, spending most of their time in and around the water.

它们属于半水生动，绝大部分时间在水里和水边。

Next to the dunes they found a dry lake bed, which helped explain the large concentration of aquatic animals.

他们在沙丘旁边发现一个干涸的湖床，有助于解释大量聚集的水生动。

In fact, paleontologists once thought duckbill dinosaurs were aquatic, but that theory eventually fell out of favor.

事实上，古生学家曾经认为鸭嘴恐龙是水生动，个理论最终失宠了。

These substances support the growth of cyanobacteria, which can have poisonous effects on water animals and humans.

些质支持蓝绿藻的生长，而蓝绿藻可能会水生动和人类产生有毒影响。

They may be the most well-known underwater singer-songwriters, but they're far from the only aquatic animal that makes noise.

它们可能是最著名的水下创手，它们并不是唯一会发出声音的水生动。

We think of fish as completely aquatic animals.

我们认为鱼完全是水生动。

That makes all of these groups secondarily aquatic.

使得所有些群体都是次要的水生动。

Unlike Palaeocastor and its burrowing cousins, these animals were semiaquatic.

与 Palaeocastor 及其穴居近亲不同，些动是半水生动。

But we do not know what one-tenth of the water-things eat; so we are not answerable for the water-babies.

是我们不知道十分之一的水生动吃什么； 所以我们不水宝宝负责。

So one of the best things for any aquatic animal to communicate, especially across long distances, is by sound rather than sight.

因此，于任何水生动来说，最好的交流方式之一，尤其是长距离交流，是通过声音，而不是视觉。

This tragic discovery is just one of the many ways the health of aquatic animal communities can help us better understand Earth's oceans.

种悲剧的发现只是，我们通过水生动健康状况，来更好地了解地球海洋的方式之一。

Likewise, if you were aquatic, your habitat and your food supply, might have been less disturbed by the fires.

同样，如果你是水生动，你的栖息地和食供应可能不会受到大火的干扰。

Penleve was a pioneer in underwater filmmaking, and a lot of his short films focus on the aquatic animal world.

Penleve 是水下电影制的先驱，他的很多短片都关注水生动世界。

Others like seals and sea lions are semi-aquatic, spending most of their time in the water for coming up every now and then.

其他动，如海豹和海狮是半水生动，它们大部分时间都在水中度过，偶尔会浮出水面。

Of aquatic animals, there are many self-fertilising hermaphrodites; but here the currents of water offer an obvious means for an occasional cross.

水生动中， 有许多自花受精的雌雄同体； 里的水流为偶尔的交叉提供了明显的途径。

And if a water animal can continually change into a land animal, why should not a land animal sometimes change into a water animal?

如果水生动可以不断地变成陆生动， 为什么陆生动有时不能变成水生动呢？

Now, as you can tell by now, becoming secondarily aquatic required a lot of changes to many different parts of the body.

现在，正如你现在所知道的，成为二级水生动需要身体的许多不同部位进行大量改变。

From Red Caps they moved on to Kappas, creepy water-dwellers that looked like scaly monkeys, with webbed hands itching to strangle unwitting waders in their ponds.

他们从红帽子又到了卡巴，是一种爬行的水生动，看上去像有鳞的猴子，双手有蹼，忙着要扼死不知深浅地走在它们池塘里的涉水者。

One of the earliest cetaceans was  Ambulocetus, also known as the " walking whale." Ambulocetus was likely semi-aquatic, reproducing  on land while feeding underwater.

最早的鲸类之一是步行鲸，也被称为“行走的鲸” 。 步行鲸很可能是半水生动，在陆地上繁殖， 在水下觅食。