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Extinction
The Cretaceous–Paleogene (K–Pgextinction event,[a] formerly known as the Cretaceous–Tertiary (K–Textinction,[b] was a mass extinction of some three-quarters of plant and animal species on Earth—including all non-avian dinosaurs—that occurred over a geologically short period of time, 66 million years ago.

This is attributed to an asteroid hitting the Earth.