Stegosaurus offers more mysteries, such as how it could function with its tiny brain. The image of dinosaurs as massive beasts with walnut-sized brains is not true of many dinosaurs, but it is true of Stegosaurus.
It has even been suggested that Stegosaurus had a second brain to control its hindquarters, since the one in its head seems to be too small to manage the entire beast. But it was, and it did. Stegosaurus had only one, small brain.
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