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Groups of dinosaursDinosaurs are divided into two basic groups.Ornithischians were dinosaurs that had bird-like hips and other features that you can find in modern birds. Many had a skin made of plates and most of them were plant eaters. The Stegosaurus, for example, was a plant-eating dinosaur with a small head. It reached a length of up to 10 meters.Saurischians were dinosaurs that had hips like lizards. Some of them belonged to the largest creatures that ever roamed the Earth.The Brontosaurus, for example, was an enormous animal. It had a long neck, a small head and ate plants from trees. It moved slowly because it was so heavy. Some Saurischians were meat-eating dinosaurs. The fiercest of all was the Tyrannosaurus rex, the king of lizards. The T. rex was almost 4 meters tall and had sharp teeth. It had short front legs but very strong and massive hind legs. Tyrannosaurs roamed across North America and Central Asia towards the end of the Mesozoic period.
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