Period: The Allosaurus lived in the late Jurassic period, 154-144 million years ago.

Habitat: The Allosaurus lived in W. North America, and Australia.

Diet: The Allosaurus was a Carnivore (a meat eater).

Size: The Allosaurus was 38 feet (12 m).

Description: The Allosaurus was a powerful predator that walked on two powerful legs. The Allosaurus had an s-shaped neck,and a vertebrae that were different from those of other dinosaurs. The Allosaurus had a massive tail, a bulky body, and heavy bones. The Allosaurus' claws were up to 6 inches. The Allosaurus was up to 38 feet long and 16.5 feet tall. The Allosaurus weighed about 1400 kg. The Allosaurus had a 3 feet long (90 cm) skull with two short brow-horns and bony knobs and ridges above its eyes and on the top of the head. The Allosaurus had powerful jaws and long, sharp, serrated teeth 2 to 4 inches (5 to 10 cm) long.