Argentinian paleontologists have unearthed a new species of ancient crocodile, Kostensuchus atrox, that coexisted with dinosaurs. The remarkably complete fossil, found in Patagonia, reveals a 3.5-meter-long, 250-kilo hypercarnivore with serrated teeth. This discovery provides crucial insights into the anatomy and evolutionary history of peirosaurids, apex predators that thrived in Gondwana during the Late Cretaceous period.