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Allosaurus was a fairly large theropod that roamed in the Jurassic period about 100 million years ago, they had a massive skull on a short neck, a long, … more »

Allosaurus was a fairly large theropod that roamed in the Jurassic period about 100 million years ago, they had a massive skull on a short neck, a long, slightly elevated tail, and reduced forearms. They weighed around 1,000 to 4,000 kg as a full grown adult and were around 30-40ft in length.

As an Apex predator they ruled the lands well before T-Rex came along.

Many paleontologists agree that Allosaurus was an active predator of large animals. There is dramatic evidence for allosaur attacks on Stegosaurus, including an Allosaurus tail vertebra with a partially healed puncture wound that fits a Stegosaurus tail spike, and a Stegosaurus neck plate with a U-shaped wound that correlates well with an Allosaurus snout. « Less