Together with the bony frill behind its extraordinarily large head, the three distinctive horns of the Triceratops were traditionally viewed as defensive weapons for this mighty herbivore.
However, it is likely that they were used in courtship and dominance displays, much as modern deer use their antlers. One of the last groups of dinosaur to evolve, Triceratops would have shared the landscape with, and been preyed upon by, the awesome Tyrannosaurus.
There is little evidence that they ever had the spectacular battles so often depicted, however. No complete Triceratops skeleton has yet been found and what was thought to be another horned dinosaur, Torosaurus, has recently been identified as the fully mature form of Triceratops.
Source from :http://www.bbc.co.uk
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