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65.5 million years ago, an asteroid with a diameter of 6 miles crashed into what is now the Yucatan Peninsula, creating the Chixculub crater. It threw so much dust into the atmosphere, that sunlight was blocked for months. Plants died without sunlight, and the herbivorous dinosaurs died without plants to eat. The carnivores soon died out, too, because their prey was gone.

There is evidence, too, that the Chixculub impact preceded the dinosaur extinction by hundreds of thousands of years, until another, possibly larger asteroid struck and eliminated the non avian dinosaurs once and for all. Even without the asteroids, dinosaurs were already dealing with the negative affects of climate change.

Since birds are dinosaurs by definition and since they survive to present day, you could also say that dinosaurs NEVER went extinct.

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