Albertosaurus fed on horned dinosaurs, duck billed dinosaurs, and even the armored Ankylosaurus.

阿尔伯特龙进食带角的恐龙、鸭嘴龙甚至披盔戴甲的甲龙。

Take Psittacosaurus, a small horned dinosaur that used to run around China.

以鹦鹉嘴龙为例，它是一种曾经在中国四处奔跑的小型有角恐龙。

Meanwhile, horned dinosaurs like Triceratops almost all lived in North America.

与此同时，像三角龙这样的有角恐龙 几乎都生活在北美。

Because its little relative Psittacosaurus had bristles, perhaps larger horned dinosaurs did, too.

因为它的小亲戚鹦鹉嘴龙有刚毛，也许更大的有角恐龙也有。

So it seems that horned dinosaurs, did not grow their weapons until they were big enough to use them.

所以看起来有角的恐龙，直到它们大到可以使用它们时才长出它们的武器。

By doing this we can get an idea of what kinds of adaptations evolved at certain times during the evolution of horned dinosaurs.

通过这样做，我们可以了解在有角恐龙进化过程中的特定时间进化出什么样的适应性。

And after cleaning up the site, it looks like part of skull of a triceratops, a horned dinosaur, and maybe parts of the skeleton.

清理现场后，它看起来像是三角龙、有角恐龙的头骨的一部分， 也许还有骨骼的一部分。

In 2003, he nabbed his first big find: the skull of a Stygimoloch, a rare horned dinosaur that roamed the North American plains around 70 million years ago.

2003 年，他获得了第一个重大发现：冥河龙头骨，这是一种罕见的有角恐龙，大约 7000 万年前在北美平原上漫步。

And one specimen of the little horned dinosaur Psittacosaurus was even found to have melanosomes in its skin, revealing that the dino was dark on top and light underneath.

一只小角恐龙 Psittacosaurus 的标本甚至被发现在它的皮肤上有黑素体，这表明这种恐龙的皮肤是黑色的， 下面是浅色的。

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。

The test of fighting skills between the tyrant dinosaurs, like Albertosaurus on one hand, and the horned dinosaurs, like Pachyrhinosaurus at the other, that's a test of the extremes for the meat eaters and the plant eaters.

格斗技巧的测试，一边是一种暴龙，比如说阿尔伯特龙，另一边是有角恐龙比如说肿鼻角龙，这就是肉食动物跟植食动物之间的终极考验。

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。