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" ... Five big mass extinction events are recognized by paleontologists. At the end of the Ordovician some 443 million years ago, when an estimated 86% of all marine species disappeared. At the end of the Devonian some 360 million years ago, when 75% of all species disappearance. At the end of the Permian some 250 million years ago, the worst extinction event so far with 96% of all known species lost. At the end of the Triassic some 201 million years ago, when 80% of all species disappeared. The most famous mass extinction happened at the end of the Cretaceous some 65 million years ago, when 76% of all species went extinct, including the large dinosaurs and ammonites. Minor extinction events also happened, like the extinction of the Pleistocene megafauna at the end of the ice-age some 10,000 years ago. ... "