Wild horses first evolved here and became dominant grazers.

野马首先在这里代代，主宰了这里的草地。

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

但在这些食草动物被喂食名为3-nitrooxypropanol的抗嗝化合物后，甲烷的排放量正在减少。

Smaller grazers are still found here, too.

这里也能找到小型食草动物。

They are grazers and live in flocks.

它是草食动物，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的食物。

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

在高原周围温暖的平原和山谷, 食草动物都在前进。

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

叉角羚曾经与像今日仍旧存活的野牛那样的其食草动物共伴而生。

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

这种化学物质会限制食草动物的血液流向四肢，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.

干旱存活了下来，最终在数量上超过了马，成为了最大的食草群体。

And grasslands are made by grazers.

草原是由放牧者制造的。

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

像野马这样的食草动物，它的栖息地发生了大规模改变，而没有足够的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.

它成为小型刮食动物的食物来源，形成食物网的底层，食物网随著深度延伸至中水层，甚至更远。

Bison were the primary historical grazer.

野牛是历史上主要的食草动物。

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，食草动物，如成群的牛和美洲黑尾鹿——它的天敌已经被我猎杀到几近局部灭绝的地步——会啃食潘多新生的枝桠。

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物的消化器官的反刍动物，野牛能够草中吸收更多的营养，这也许能够解释为什么能够幸存下来，而像野马一样的食草动物却已经灭绝。

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的生物放进生态系统，且它吃的食物和一些当地物种一样，那么那里就会产生竞争，或者，那里有食草动物，比如鹦鹉鱼。