When Did the Dinosaurs Live?The Mesozoic Era, which began 245 million years ago and lasted for 180 million years, is sometimes called the Age of Reptiles. It is divided into three periods.
|Period||Millions of years ago||Events|
|Rise of small, lightly built dinosaurs|
|Flying reptiles, frogs, turtles, crocodiles appear|
|Giant herbivores, like Diplodocus, emerge|
|First appearance of birds|
|Cretaceous||146-65||Great variety of dinosaurs|
|Large carnivores, like T. rex, emerge|
|At end of Cretaceous dinosaurs go extinct|
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