Allosaurus is a genus of large theropod dinosaur that lived during the Late Jurassic period, around 156 to 145 million years ago. The name Allosaurus means “different lizard” in Greek. It had a large skull with sharp teeth and powerful jaws, as well as a long, heavy tail.

Allosaurus stood around 15 to 20 feet tall and measured up to 40 feet in length. It is one of the most well-known and iconic of the Jurassic dinosaurs. Allosaurus is believed to have been a predator, hunting large plant-eating dinosaurs such as sauropods. Fossils of Allosaurus have been found in North America, Africa, and Portugal.