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。

Dugongs are the largest herbivores in the sea.

儒艮是海洋里最大食草动物。

And you're right, they are herbivores, they eat grass.

你猜对了，狒狒是食草动物，他们吃青草。

The cause of this crisis? Herbivores, mostly deer.

这场原因是什么？食草动物，主要是鹿。

And where there's grass, there are herbivores, also known as plant-eaters.

而有草地方，就有食草动物，也就是吃植物。

Smaller grazers are still found here, too.

这里也能找到小型食草动物。

Where plants abound, herbivores will not be far behind.

植物比比皆是地方食草动物出现也不会落后。

Because while they maybe vegetarians, it's still wise to " hoof" it .

然它们可能是食草动物，但最好还是离远一点。

Predator numbers cannot increase until herbivores grow.

在食草动物生长之前，捕食者数量不会增加。

Hundreds of years ago, animals known as grazers would simply have eaten this vegetation up.

几百年前，食草动物会直接吃掉这些植被。

Thorns help protect the plant from plant-eating animals.

刺有助于保护植物免受食草动物伤害。

They increased their levels of an enzyme called lipoxygenase, which is known to deter herbivores.

这些番茄脂肪氧化酶水平会上升，这种酶已知被用来检测食草动物。

Most herbivores supplement a leafy diet with higher energy foods like fruit and seeds.

大多数食草动物在吃叶子同时也会食用其它更高能量食物，比如水果和籽类。

Wait a minute. I thought rhinos were vegetarians.

等一下，你们犀牛应该是食草动物吧？

The animals themselves are the consumers, and are either herbivores or carnivores.

动物自身是取食者，或为食草动物，或为食肉动物。

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抗嗝化物后，甲烷排放量正在减少。

This lumbering vegetarian is no threat to the llamas, but it does arouse their curiosity.

雕齿兽是一种食草动物，它对于美洲驼没有威胁，但是却激起了它们好奇心。

So back the time, there were millions of big herbivores roaming the landscape.

回到过去，有数百万大型食草动物在这片土地上漫游。

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物共伴而生。

Herbivores, for example, leave a third of food nutrients in their poop.

例如，食草动物大便中含有三分之一食物营养。