Tyrannosaurus was a large theropod dinosaur that lived in the Late Cretaceous period about 74 million to 70 million years ago. It is a distant relative of Tyrannosaurus Rex, mainly distributed in Mongolia and China in Asia. Fossils have also been found in Inner Mongolia, Xinjiang and other places. It is one of the largest carnivorous dinosaurs found in Asia. It has dozens of sharp teeth and strong bite force. The lower jaw has a special joint structure, which gives it an advantage when hunting. The forelimbs are the shortest and smallest in the family Tyrannosauridae, with strong hind limbs and a long, heavy tail for balancing the body. At the top of the food chain, it is a top predator, feeding mainly on large dinosaurs. Vision is poor, but the sense of smell and hearing developed.

Allosaurus is one of the most famous large carnivorous dinosaurs, occupying the top of the food chain in late Jurassic terrestrial ecosystems. Its model species, the fragile Allosaurus, was created by the great American paleontologist Osnil in the 20th century Marsh described the naming in 1877. They are also the most abundant and widely distributed predators discovered in the Late Jurassic period. Adult Allosaurus can grow up to 9 meters in length, with a few individuals believed to reach up to 12 meters. Although not as robust as the Tyrannosaurus rex, the body proportions of the Allosaurus are more symmetrical, with more developed forelimbs, making it appear more agile. The number of specimens is also much larger than that of Tyrannosaurus rex.