Wild horses first evolved here and became dominant grazers.

野马首先在这里代代繁衍，并主宰了这里草地。

But those methane emissions might get cut—by feeding the grazers something called 3-nitro oxypropanol.

但在这些食草动食名为3-nitrooxypropanol抗嗝化合后，甲烷排放量正在减少。

Smaller grazers are still found here, too.

这里也能找到小型食草动。

They are grazers and live in flocks.

它们是草食动，结群而居。

These grazers find sustainment ingresses others have abandoned.

这些羚羊发现了一些别人剩下食。

On the warmer plains and valleys that surround the plateau, grazers are on the move.

在高原周围温暖平原和山谷, 食草动都在前进。

The pronghorn lived alongside other grazers still around today, including bison.

叉角羚曾经与像今日仍旧存活野牛那样其他食草动共伴而生。

This chemical restricts blood flow to the grazer's extremities, which can lead to the loss of limbs.

这种化学质会限制食草动液流向四肢，进而引发肢体损伤。

They managed to survive the drought, eventually expanding in number to replace the horse as dominant grazer.

他们从干旱存活了下来，并最终在数量上超过了马，成为了最大食草群体。

And grasslands are made by grazers.

草原是由放牧者制造。

For grazers such as horses, this led to a massive change in habitat, one they were not flexible enough to overcome.

像野马这样食草动，它们栖息地发生了大规模改变，而他们并没有足够能力来适应这些改变。

They become food for small grazers, forming the base of the food web, which extends back down to the Twilight Zone — and beyond.

它们成为小型刮食动食来源，形成食网底层，食网随著深度延伸至中水层，甚至更远。

Bison were the primary historical grazer.

野牛是历史上主要食草动。

And secondly, grazers like herds of cattle and mule deer— whose natural predators we've hunted to the point of local elimination — are eating Pando's fresh growth.

第二，食草动，如成群牛和美洲黑尾鹿——它们天敌已经我们猎杀到几近局部灭绝地步——会啃食潘多新生枝桠。

As ruminants with multi-chambered stomachs, bison can extract more nutrients from grass and this may help explain why they survived when other grazers such as the wild horses did not.

正是由于是有多个储存食消化器官反刍动，野牛能够从草中吸收更多营养，这也许能够解释为什么他们能够幸存下来，而像野马一样食草动却已经灭绝。

If you put them something into the ecosystem that's not supposed to be there and they're eating the same food as some of your native species, there's competition there or there's grazers, like your parrot fish.

如果你把一些本不应该存在生放进生态系统，并且它们吃食和一些当地种一样，那么那里就会产生竞争，或者，那里有食草动，比如鹦鹉鱼。