There were lots of species of Ceratopsians, these were the horn dinosaurs.

有很多种角龙，这些是长角的恐龙。

Ceratopsian bone beds almost certainly all represent catastrophes.

肿鼻角龙骨床几乎可以肯定代表着大灾难。

Pachyrhinosaurus like pretty much all members of the Ceratopsian family have no weaponry from behind their neck backwards.

肿鼻角龙和角龙家族的所有成员一样，从颈部往后没有什么武器。

Pachycephalosaurs are more closely related to ceratopsians.

厚头龙与角龙类的关系更为密切。

Agility-wise Tenontosaurus is certainly much better off than, any of the Ceratopsians or Sauropod dinosaurs.

任何角龙类和蜥脚类的恐龙都没有腱龙灵活。

Ceratopsians and Pachycephalosaurus appear for the first time, and some Ankylosaurus have evolved tail clubs.

角龙类和厚头龙属首次出现，部分甲龙进化出尾巴。

These features are used to differentiate between ceratopsian species.

这些特征用于区分角龙类物种。

And this baby ceratopsian was no exception.

这只角龙宝宝也不例外。

And in the fossil record, we see that with the Ceratopsian dinosaurs, that, every now and then, things did go wrong.

在化石证据里，我们能够看到角龙，不时地就会出现问题。

And Saurolophus angustirostris from Mongolia, we also know that ceratopsians had scaly skin.

还有来自蒙古的Saurolophus angustirostris，我们也知道角龙类的皮肤是鳞片状的。

Many of the ceratopsians also had horns over their eyes.

许多角龙的眼睛上也有角。

This specimen tells us a lot about how ceratopsian dinosaurs developed.

这个标本告诉我们很多关于角龙类恐龙是如何进化的。

But there were abundant remains of one species of dinosaur from the same fossil formation: Protoceratops, a small, hornless ceratopsian.

但是，同一化石地层中有一种恐龙的大量遗骸：原角龙，一种小型无角角龙。

Overall, the body and limbs of Ceratopsians are highly conserved, meaning that they are quite similar to one another.

总的来说，角龙类的身体和四肢是高度保守的，这意味着它们彼此非常相似。

Male and female ceratopsians, for example, have been suggested to have different horn shapes and sizes.

例如，雄性和雌性角龙被认为具有不同的角形状和大小。

This ceratopsian has a beak and a frill.

这只角龙有喙和褶边。

However, because many ceratopsians are known from single specimens, it becomes hard to say anything definitive about sexual dimorphism.

然而，由于许多角龙都是从单一标本中发现的，因此很难对两性二态性做出任何明确的判断。

We call ceratopsians with a nasal horn and these small frill bones ceratopsid ceratopsians.

我们称长有鼻角的角龙为角龙类，而这些带褶边的小骨头为角龙类。

Although Pachyrhinosaurus doesn't have the same massive size and weaponry as the other members of the Ceratopsian family, they are still pretty powerful and dangerous dinosaurs.

尽管肿鼻角龙没有角龙家族的其它成员庞大的身躯和武器库，它们仍然是非常强大危险的恐龙。

Later in their evolution, ceratopsians evolved a nose horn and small bones on the edge of the frill.

在进化的后期，角龙进化出了鼻角和褶边边缘的小骨头。