A fossil found in Argentina shows that up to the very end of the age of dinosaurs, they faced serious competition from other reptile species.

A fossil discovered in Patagonia shows a 3.5-metre-long reptile from the late Cretaceous with large, serrated teeth capable of slicing through muscle

Paleontologists have discovered the fossilized remains of a crocodile "hypercarnivore" that lived in what is now Argentina some 70 million years ago—and it ate dinosaurs. Named Kostensuchus atrox, the species lived during the Maastrichtian age at the very end of the Cretaceous period, just before the extinction of the dinosaurs.