They are communicative, social beings that live in herds.

它们是善于沟通的群居动物。

In other words, they live in groups, they live in herds.

换一句话说，它们成群生活。

And you see goats in herds of 20 roaming around over the islands, easily.

你会看到20只成群的山羊在岛上四处游荡。

That's why giraffes travel in herds—there's always someone watching for trouble.

这也就是为什么长颈鹿选择群居，它们需要轮流为彼此放哨。

Just as cows, sheep and bison roam in herds today, so, too, did plant-eating dinosaurs.

就像现在成群行动的牛、羊和野牛那样，食草恐龙当年也如此。

Just like cows, sheep and bison roam in herds today, so, too, did plant-eating dinosaurs.

就像今天的奶牛、绵羊和野牛成群结队地游荡一样，食草恐龙也是如此。

And these catastrophes only happen when the animals are moving together in herds.

这些灾难只可能在动物成群迁移时发生。

Animals lived in herds for many other reasons.

出于许多其他原因， 动物群居。

That horn can cause some fatal wounds and the fact that they lived in herds makes them that much more dangerous.

它的角能造成致命伤害，而且它们成群生活，使它们更危险。

Second, just because edmontosaur lived in herds doesn’t mean they migrated.

其次， 仅仅因为埃德蒙顿龙群居并不意味着它们会迁徙。

Living in herds, for example, provides animals extra protection from predators.

例如，群居可以为动物提供额外的保护， 使其免受捕食者的侵害。

Unlike other species of deer, moose do not live in herds, preferring to be mostly alone except when mating or caring for calves.

相比其他的群居鹿类来说，驼鹿更喜欢独自生活，除非到了交配或者照顾幼崽的时候。

Next up, towns across America are hiring new firefighters in herds and they don't look like you'd expect them to because they're goats.

接下来，美国各地的城镇都在雇佣新的消防队员，他们看起来不像你想象的那样，因为他们是山羊。

So then they brought in helicopters with trained sharpshooters brought in from New Zealand to fly around and mow down the goats in herds.

于是他们从新西兰请来了直升机和训练有素的神枪手，在空中飞来飞去，射杀成群的山羊。

Roosevelt elks live in the forests of western United States, they live in herds, but they do not migrate.

罗斯福麋鹿生活在美国西部的森林中， 它们群居，但不迁徙。

The woods were full of cattle, very shy and wild, dashing away in herds, with a loud snuff, at our approach.

树林里到处都是牛， 非常害羞和野性，在我们走近时， 它们成群结队地奔跑， 发出响亮的鼻烟。

But on the flip side, the horned dinosaurs have the power of numbers, the power to operate in herds, these cranial weapons whether they're horns or lumps, they survived against the tyrant dinosaurs pretty well.

不过另一方面有角的恐龙有数量优势，能够成群协作，这些不管是角还是鼓包的头部武器，它们对抗暴龙生活得还不错。

So maybe one in a hundred of the bone beds that we find turns out to be one of these mass death sites where we have horned dinosaurs that were travelling in herds that died all at once.

我们发现的骨床里面有百分之一会是这些带角恐龙大规模死亡之处，在这里角龙成群旅行突然死亡。