The most recent mass extinction is probably also the most famous. It is the one that occurred at the boundary between the Cretaceous and Paleogene periods. This event, formerly known as the K-T extinction (which stood for Cretaceous-Tertiary) but now officially known as the K-Pg extinction (because the Tertiary Period was renamed the Paleogene), occurred 66 million years ago. It is most commonly known as the one that killed off the dinosaurs. But dinosaurs weren’t the only species to go extinct. About three-quarters of the species and half the genera alive at the time disappeared, including
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