Around 252 million years ago, Earth experienced its most catastrophic extinction event. Widely known as the Permian extinction and dubbed the “Great Dying,” it wiped out an estimated 90 percent of ...

Around 70 million years ago, in what is now southern Patagonia, a powerful predator stalked the floodplains. This ancient reptile, named Kostensuchus atrox, wasn’t a dinosaur — but it may have fed on ...