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The herbivorous stegosaurus was not a very intelligent creature. Its nine-metre-long body was dominated by a brain the size of a human fist, but when it came to life, it could be a deadly opponent. The stegosaur's tail, which it wielded like a club, was tipped with four sharp spikes up to 90 centimetres long. Another hallmark of this dinosaur was the two rows of bone plates on its back. The massive growths did not function as armour. Because they weren't connected to the skeleton and were richly interwoven with blood vessels, it's thought that they were used for thermoregulation or to communicate during mating and in dangerous situations.
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