Q:

How long did dinosaurs live on Earth?

A:

Quick Answer

Dinosaurs lived on Earth for about 175 million years, until they were entirely wiped out by the K-T extinction event at the end of the Cretaceous Period. They lived during the Mesozoic Era, and examples of dinosaurs can be found in all three periods of that era.

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Full Answer

If birds are counted as dinosaurs, then dinosaurs never actually went extinct at all and continue to survive as a group into the present day, making for a total of 250 million years. However, no non-avian dinosaurs are known to have survived the Cretaceous extinction event. Although the first dinosaurs appeared early in the Triassic Period, they did not diversify extensively until the Jurassic Period.

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