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Stegosaurus

This was a herbivorous dinosaur living the early Jurassic of the order Ornithischia which had a spiny tail and plates on the on the back for display. The display was mostly when mating and when confronted by a predator, this was achieved by pumping blood into the plates. The spiny tail also served as a weapon when struck on a potential enemy3.

Stegosaurus: http://www.bbc.co.uk/sn/prehistoric_life/dinosaurs/chronology/152mya1.shtml