#2: All Dinosaurs lived on land.
While some dinosaurs might have been able to wade or paddle through water, they did not live in oceans, lakes, or rivers. Mosasaurs and Plesiosaurs, the giant swimming reptiles that also lived during the Mesozoic Era, were not dinosaurs. Nor were the ancient flying reptiles, known as pterosaurs.
Dinosaur Characteristic 3:All Dinosaurs Were Vertebrates. Large or small, dinosaurs were all backboned animals that shared similar skeletal features.
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