Postosuchus

Postosuchus was a predator from the Middle Triassic. It was more than five metres and weighed around a whopping half a tonne. The animal didn't hunt in packs, as it would've fiercely battled its own kind. These archosaurs were fiercey territorial, and could easily smash a Coelophysis to its death. A strong predator, they died out by 220 million years ago. They lived in America.

This dinosaur was featured in Walking With Dinosaurs.