Dinosaurs are a group of archosaurs that reigned during the Mesozoic period. Dinosaurs evolved directly into birds. Dinosaurs evolved into many different forms throughout the Mesozoic, and were both carnivorous, herbivorous, and were both quadrupedal and bipedal. Among the most popular dinosaurs include: Tyrannosaurus, Triceratops, Brachiosaurus, Velociraptor and modern birds.

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