The famous three-horned dinosaurs probably fought one another, which would explain why a Triceratops fossil nicknamed Big John has an injury to its head shield that looks like it came from a Triceratops horn.
There is a large hole in the right side of Big John’s neck frill. D’Anastasio’s team found evidence of newly formed bone around the edges of the hole, as well as signs of inflammation. This suggests Big John experienced the injury while still alive, and that the wound partially healed before the animal’s death.What caused the injury? “The shape and size of the lesion coincides perfectly with those of a triceratops horn similar in size to Big John,” says D’Anastasio.
It is also unclear which other dinosaur species fought amongst themselves, due to a lack of evidence. “To the best of my knowledge,” says D’Anastasio, “there are no other cases of intraspecific fighting in other dinosaurs.”
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