Allosaurus was the most common large carnivore of the Late Jurassic in North America. It was a smaller predecessor of the Cretaceous Tyrannosaurus. Strong forelimbs with sharp claws, powerful hind ...

The allosaurus lived from 155 to 144 million years ago, during the Late Jurassic Period. An apex predator competing with the tyrannosaurus rex, the average adult specimen stood over 15 feet all ...