World Dinosaur discovered in Argentina suggests why many prehistoric predators had small arms July 8, 2022July 10, 2022Wyatte Grantham-Philips, USA TODAYComments Off on Dinosaur discovered in Argentina suggests why many prehistoric predators had small arms Paleontologists discovered a dinosaur species in Argentina, the Meraxes gigas. The predator looks a lot like a T. rex but isn't closely related.