When Dinosaurs Ruled the Earth

When Dinosaurs Ruled the Earth | The "Age of Dinosaurs" was the Mesozoic Era, spanning approximately 252 to 66 million years ago. This immense stretch of time is divided into three periods: the Triassic (when they first appeared), the Jurassic (when they reached their largest size), and the Cretaceous (when they diversified greatly before a mass extinction wiped out the non-avian dinosaurs).

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