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DeviantDinosaurs
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On the other hand, I dont see the function of the back quills neither... but apparently triceratops had them, as we know for one specimen yet to be described. They already have the horns and big frills for display, and the quills doesnt seem a good defensive weapon at all. They´d would rather be a vestigial trait from ancestors like Psittacosaurus, who lacked big horns and frills and need them for the display or small theropod intimidation.