The oldest known horned dinosaur in North America is called Zuniceratops.

目前在北美地区发现的最为古老的有角恐龙是祖尼角龙。

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I was looking at the snout of a Pachyrhinosaurus, a particularly odd horned dinosaur, a rare relative of Triceratops.

我盯著厚鼻龙的口鼻部，牠是只奇特的独角恐龙，是三角龙属的亲戚，不过数量十分稀少。

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He helped unearth 16 fossilized triceratops, the scary three-horned rhinoceros-like dinosaur thought to have fought the giant Tyrannosaurus rex.

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