Belonging to the theropod group of dinosaurs, the Allosaurus (Allosaurus fragilis) inhabited what is now North America during the Late Jurassic, approximately 155 to 145 million years ago. It was first described and named by paleontologist Othniel Charles Marsh in 1877. Since then, numerous fossils of Allosaurus have been discovered.

Allosaurus was a large predator, measuring up to 10 meters in length and weighing several tons. It possessed a powerful and agile body, with strong hind limbs and shorter forelimbs armed with sharp claws. Its most distinctive feature was its large, serrated teeth, adapted for tearing through flesh and bone.

As a top predator, Allosaurus occupied a dominant position in the Late Jurassic food chain. Its primary diet mainly comprised of herbivorous dinosaurs such as Stegosaurus and sauropods, but it is also believed to have scavenged on carcasses. Allosaurus employed a combination of speed, agility, and its formidable jaws to subdue its prey, using slashing bites to incapacitate and consume substantial portions of flesh.