Stegosaurus. Artwork of a Stegosaurus (Stegosaurus sp.) dinosaur. Stegosaurs ("roofed reptiles") were herbivores that lived throughout the world around 150 million years ago during the Jurassic period. They reached about 6 metres (m) long and 2.5m high at the hips, weighing about 1.5 tonnes. The distinctive broad plates running in two rows along their backs are thought to have helped control their body temperature by radiating or absorbing heat. Stegosaurs defended themselves with the long spikes on their tails. They had tiny brains in relation to their size.
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