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Archosaurs (literally 'ruling lizards') are a large group of reptiles that
appeared about 250 million years ago.
As well as giving rise to the dinosaurs, they include non-dinosaur
groups such as the pterosaurs (flying reptiles),
now extinct, and crocodiles whose descendants still
live today.
As well as these non-dinosaur archosaurs there were many
other ancient reptiles that are often wrongly called dinosaurs.
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