Dinosaurs became extinct about 65 million years ago, at the end of Cretaceous times.
They had existed for 130 million years. No one knows why they died out.
Many other types of animals died out at the same time as the dinosaurs, including
flying and sea reptiles. but few reptiles did survive , including turtles, lizards
and snakes . there are many theories to explain why the dinosaurs died out ,including
changes of climate and vegetation, cold winters, new parasites and diseases.
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