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Anther occurred when the Cretaceous period became the Tertiary about 65 million years ago, when 75 percent of species disappeared. This article is about the first mass extinction at the end of the Ordovician geological period 440 million years ago, when about 86 percent of species were killed.
More birds evolved, and reptiles got bigger. Dinosaurs were still dominant, and carnivorous dinosaurs were more prevalent. At the end of the Cretaceous Period, and the end of the Mesozoic Era, came another mass extinction. This extinction is generally called the K-T Extinction.