Paleontologists have long speculated that the horns and frill of Triceratops, in addition to providing a formidable defense against predators, were also used to fight members of the same species. Scientists say they’ve found the most compelling evidence yet in favor of this intriguing possibility.
source https://gizmodo.com/famous-big-john-fossil-is-more-evidence-that-tricerat-1848763186
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