Allosaurus was a large theropod predator, typical in body shape with long powerful hind legs, a long tail and a large head full of sharp teeth. It had two small bony crests above and ahead of their eyes, and two smaller ones behind them and a low, narrow, bony ridge from eyes to snout. Its skull was deep, and the jaws contained an impressive array of flattened, serrated teeth. The forelimbs were muscular and ended in 3 fingered hands with powerful grasping claws, while the hind limbs were massive but capable of rapid movement.
Length 10 - 12 m (33 - 40 ft)
Weight 1 - 1.7 tons