PHOTOS: Triceratops Battle Scars Found on Skull

PHOTOS: Triceratops Bones May Bely Battles
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Researchers have long theorized that Triceratops used its horns to show off to members of the opposite sex. A January 2009 study of 53 skulls suggests that the horns were also used to fight other Triceratops. The plant-eaters roamed part of what is now the U.S. West, between 65 and 144 million years ago.

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