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。

Even more so than dinosaurs like Pachycephalosaurus, or modern head-butters like muskox and rams.

甚至比像厚头龙这样的恐龙，或者像麝牛和公羊这样的现代头撞动物更重要。

No, the study was able to show that Pachycephalosaurus could butt heads, but not that they did butt heads.

不，这项研究能够表明 Pachycephalosaurus 可以用头撞人，但并不能证明它们确实用头撞人。

This is the skull of a small Pachycephalosaurus from Alberta called Stegoceras.

这是来自艾伯塔省的一种名为剑角龙的小型厚头龙的头骨。

Pachycephalosaurus skull domes have intrigued us for decades and many palaeontologists think that they're an example of an intraspecific combat weapon.

几十年来，厚头龙的头骨穹顶一直吸引着我们，许多古生物学家认为它们是种内战斗武器的一个例子。

Tyrannosaurus, Triceratops, and Pachycephalosaurus, however were all alive at the end of the Mesozoic Era, so answers B, C, and, D are correct.

然而，霸王龙、三角龙和厚头龙都在中生代末期还活着，所以答案 B、C 和 D 是正确的。

Pachycephalosaurus skulls were CT scanned, as with the skulls of Musk Oxen and other animals that are known to be head butters.

Pachycephalosaurus 的头骨进行了 CT 扫描，麝香牛和其他已知的头骨动物的头骨也进行了 CT 扫描。

You got your Triceratops, your Tyrannosaur, and one of my personal favorites, the Pachycephalosaurus But you know one animal in here that doesn't quite belong?

你有你的三角龙， 你的霸王龙，还有我个人最喜欢的一种， 厚头龙但你知道这里有一种不完全属于的动物吗？

Pachycephalosaurus are famous for having lumpy heads, this bulging mass is called the skull dome and it is nothing but a solid mound of bone.

Pachycephalosaurus 以长有块状头部而闻名，这个凸起的块被称为头骨穹顶，它只不过是一堆坚固的骨头。

It's possible that the speedier juveniles hunted small herbivores, like the roughly 2-meter Leptoceratops or the 4.5-meter Pachycephalosaurus--while bite marks on fossils tell us the adults ate big game, such as Triceratops.

速度更快的幼龙可能会捕食小型食草动物，例如大约 2 米长的 Leptoceratops 或 4.5 米长的 Pachycephalosaurus——而化石上的咬痕告诉我们成年龙吃大型猎物，例如三角龙。