Wild horses first evolved here and became dominant grazers.

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.

但在这些食草动物被喂食名为3-nitrooxypropanol抗嗝化合物后，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物。

They are grazers and live in flocks.

它们是草食动物，结群而居。

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, 食草动物都在前进。

The East African savannahs support millions of grazers.

东非大草原养育成千上万食草动物。

These grazers find sustainment ingresses others have abandoned.

这些羚羊发现了一些别人剩下食物。

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

叉角羚曾经与像今日仍旧存活那样其他食草动物共伴而生。

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.

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。

These phytoplankton then become food for countless microscopic grazers, including copepods and krill, which in turn feed a huge swath of marine life.

这些浮游植物随后成为无数微型食草动物食物，包括桡足类动物和磷虾，它们反过来又为大量海洋生物提供食物。

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

像马这样食草动物，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。

It's a long way to travel, but for a short period, the tundra is the ideal place for a grazer.

北极苔原虽然路途遥远， 但仍有短短一段时间是食草动物天堂。

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物食物来源，形成食物网底层，食物网随著深度延伸至中水层，甚至更远。

Ungulates  would become staple grazers and browsers in many ecosystems, but they also served as prey  animals for a new class of carnivores.

有蹄类动物将成为许多生态系统中主要食草动物和浏览器，但它们也成为一类新食肉动物猎物。

Bison were the primary historical grazer.

是历史上主要食草动物。

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，如成群和美洲黑尾鹿——它们天敌已经被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物消化器官反刍动物，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，而像马一样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生物放进生态系统，并且它们吃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。