Megalosaurus is a genus of large theropod dinosaurs that lived during the Jurassic Period, around 166 to 168 million years ago. It was one of the first dinosaurs to be scientifically described and named. Megalosaurus belonged to a group of dinosaurs called theropods, which were bipedal (walked on two legs) and carnivorous (ate meat).

Megalosaurus was estimated to be about 9 to 10 meters (30 to 33 feet) long and weighed around 1 to 2 tons. It had a slender build with strong hind limbs and short forelimbs. Its hind limbs were adapted for fast running and its feet had sharp claws. Megalosaurus had a large head with long, serrated teeth, which it used to tear apart its prey.

Fossils of Megalosaurus have been found in England, specifically in the Oxfordshire, Somerset, and Yorkshire regions. These fossils include bones and teeth, which provide valuable information about the anatomy and lifestyle of this dinosaur.