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Dinosaurs are a group of Archosaur reptiles of the clade Dinosauria. Dinosaurs eventually gave rise to birds.

Dinosaurs were the most powerful land animals of the Mesozoic era. Over 500 different genera of dinosaurs are known.Fossils of dinosaurs have been found on every continent.

Dinosaurs began in the Upper Triassic, about 230 million years ago (mya). The earliest date of a dinosaur fossil is that of Eoraptor and Herrerasaurus from Argentina, and Saturnalia from Brazil, 237 to 228 mya.

By the early Jurassic they were the top land vertebrates, and dominated most environments on land. They continued until the K/T extinction event 66 million years ago.