アメリカ自然史博物館のインスタグラム(amnh) - 8月3日 05時02分

Happy Dinosaurs Day! This 65-million-year-old Triceratops in the Museum’s Hall of Ornithischian Dinosaurs has a large frill on the back of its skull, two large horns over its eyes, and a smaller horn on its nose. On the side of the skull on display is a partially healed injury, perhaps caused by a conflict with another Triceratops. A Triceratops horn is the fossilized remains of what was once living bone. When this animal lived, the bone was covered in a material very similar to that in human fingernails. Technically, the term "horn" refers to the hard, thick covering around the bone; the horn was roughly 40 percent larger than the bone. The bone inside the horn is called a horn core. #DinosaursDay #dinosaur #dinosaurs #triceratops #horns #ornithischian #amnh #naturalhistory #fossil #fossils

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