Most baleen whales do not eat year-round.

大多数须鲸不是全年都在吃东西。

But the ancestors of baleen whales had a very different diet.

但是须鲸祖先的饮食习惯与这些后代的差别非常大。

Scientists studied three species of baleen whales – blue, fin and humpback.

科学家研究了三种须鲸——蓝鲸、长须鲸和座头鲸。

Well, baleen whales emit sounds around 14 hertz, the deepest among mammals.

须鲸能发出 14 赫兹左右的声音，是哺乳动物中最低沉的。

Perhaps, though, baleen whales might continue to evolve and get bigger still.

不过，也许须鲸会继续进化，变得更大。

We're trying to understand the behavior of baleen whales, of minke whales and humpback whales.

我们试图了解须鲸、小须鲸和座头鲸的行为。

The biggest whales of all (blue, humpback and so on) are baleen whales.

所有鲸鱼中最大的鲸类（蓝鲸、座头鲸等）是须鲸。

Now scientists think they have an idea of how baleen whales do it.

现在，科学家们认为他们已经知道须鲸是如何做到这一点的。

Because I've seen big baleen whales, sir, whales measuring up to 100 feet long!

我看过的大鲸鱼，先生，是长到一百英尺的大鲸鱼！

Both toothed and baleen whales often hunt by diving deep-prey being more abundant at depth.

齿鲸和须鲸通常都潜入深海捕食，因为深海里的猎物更多。

Baleen whales do not have teeth or vocal cords like humans and other mammals.

须鲸不像人类和其他哺乳动物那样有牙齿或声带。

Baleen whales suck in mouthfuls of water and extract small organisms such as krill, using fibrous buccal filters.

须鲸，用纤维状的口腔过滤器吸入大量的水，并从磷虾等小生物中吸取营养。

The study demonstrates the different reasons baleen whales may be at a heightened risk for taking in microplastics.

这项研究证明了须鲸摄入微塑料风险增加的不同原因。

By eating so much and then producing so much waste material, baleen whales help nutrients stay on the sea surface.

通过大量进食然后产生这么多的废物，须鲸促使营养物质留在海面上。

Master will reply, my friends, that baleen whales are localized, according to species, within certain seas that they never leave.

朋友们，先生的答复是这样，鲸鱼类是有地方性的，按照种类的不同；它们定居在某处海中，并不离开。

Elemans said baleen whales depend on the production of sound to communicate in the dark of the deep oceans.

埃勒曼斯说，须鲸依靠声音的产生在黑暗的深海中进行交流。

By contrast, the baleen whales the researchers looked at, once they have encountered a shoal of prey, are in nutritional nirvana.

相比之下，研究人员观察到的须鲸一旦遇到一群猎物，就处于营养极乐世界。

They analyzed the mouth of a 34-million-year-old fossil of one of the earliest baleen whales, called Llanocetus denticrenatus, found in Antarctica.

他们对南极发现的一块3400万年前的须鲸化石进行了研究，并分析了它的口腔情况，这是其中一种最古老鲸鱼“刻齿拉诺鲸”的化石。

But this isn't something baleen whales do.

但这不是须鲸会做的事情。

There are filter-feeders in the macro-world, baleen whales come to mind.

宏观世界中有滤食动物，想到须鲸。