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Stegosaurus, meaning "plated lizard", because of the plates on its back was a genus of large herbivorous dinosaurs from the Upper Jurassic of North America.

It is among the most easily identifiable dinosaurs, due to the distinctive double row of kite-shaped plates along the animal's back and the four long spikes on its tail.

Note:   The above text is excerpted from the Wikipedia article "Stegosaurus", which has been released under the GNU Free Documentation License.
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