He was a top predator in the late Cretaceous period, known for his enormous size and powerful abilities. Fossils were first discovered in 1902 by American paleontologist Barnum Brown in the Hale Creek area of Montana. The skull is huge, the teeth are sharp, the forelimbs are short, the hind limbs are strong, and the tail is long and powerful, making it an important tool for hunting and balancing the body. With a large body size and extremely strong biting force, it is one of the strongest known land predators. Fossils have been discovered in multiple regions around the world, especially in North America. It is one of the most well-known dinosaurs of the dinosaur era, but further research is needed on its classification and evolutionary history.