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Dinosaurs are a diverse group of reptiles in the clade Dinosauria. Dinosaurs went extinct near the end of the Mesozoic Era, due to a Mass Extinction event. Fossil evidence suggests that birds evolved from dinosaurs during the Jurassic period.

There are about 80 British species of dinosaurs found in Britain, including Baryonyx.

Dinosaurs are split into two major groups, Ornithischia (the bird-hipped dinosaurs) and Saurischia (lizard-hipped dinosaurs). These are then split again. Ornithischia are split into Stegosauria, Ankylosauria, Ornithopoda and Ceratopsia. Saurischia are split in to Sauropodomorpha, and Thereopoda. Strangely, the lizard-hipped dinosaurs evolved into birds.

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