Sharks are hardly newcomers to our planet. As a group they already exist at least 450 million years (opens in new tab), surviving four of the “Big Five” Mass Extinctionsincluding the catastrophe that wiped out the nonavian dinosaurs 66 million years ago at the end of the Cretaceous.
For context, that makes sharks older than dinosaurs, which arose about 240 million years ago, and even treeswhich evolved On Soil about 390 million years ago.
