Originally, it was thought that the plates were used as armor. However, if this is the case, they still left the sides unprotected.
They may have been used to keep the animal cool, or to make them look larger to potential threats or each other.
They may even have been used as a ay for stegosaurs to recognize each other.
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Stegosaurus had 17 plates on its back. The plates were in two rows on its back, but they were not symmetrical. One plate would be on the left side, and the plate on the right would be somewhat behind it, and the next plate on the left would be behind that.
Yes It Did. Just to scare off predators though. It have Blood Vessels in them so they glowed red which might have scared predators.