The mass extinction at the end of the Mesozoic was of far greater magnitude than the extinction at the end of the Permian.

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The extinction at the end of the Permian, known as the Permian-Triassic extinction event, was the largest mass extinction in Earth's history, with about 90% of species going extinct, compared to the Cretaceous-Paleogene extinction event at the end of the Mesozoic, which caused about 75% of species to go extinct, including the non-avian dinosaurs.

The Mass Extinction at the End of the Mesozoic Was