Tyrannosaurus rex, which lived in the Maastricht period at the end of Cretaceous, was one of the last non-avian dinosaur species before the Cretaceous-Tertiary extinction event, about 68.5 million to 65 million years ago.

Tyrannosaurus rex is the largest kind of Tyrannosaurus rex. The body length is about 1 1.5- 14.7 meters. The average hip height is about 4 meters. The highest hip height can reach about 5.2 meters, and the highest head height is nearly 6 meters. The average weight is about 9 tons, and the maximum head length is about 1.55 meters.

The bite force of Tyrannosaurus rex is generally 90,000 Newton-10.2 million Newton, and the maximum bite force at the end of its mouth can reach about 200,000 Newton. It is also the strongest carnivorous dinosaur.

From the appearance characteristics, the forelimbs of Tyrannosaurus rex are very small, only 22% of the hind limbs in length, and the individual length is only about 80 cm. Compared with the huge size and hind legs of Tyrannosaurus Rex, the forelimb is very small, equivalent to an adult's arm.

In terms of body length, most carnivorous dinosaurs can surpass Tyrannosaurus Rex, including Xia Long, Mantis, Dragon and Thrawn.

However, the body width, cervical vertebra width, leg length, pelvic size and scapula size of Tyrannosaurus rex far exceed those of almost all Allosaurus superfamily dinosaurs such as Mapuron and Queiroz, and it has the largest and most robust head, cervical vertebra, trunk and hind limbs among carnivores.

Carnivores and theropods (such as Ceratosaurus, Allosaurus, Ban Long, Yongchuan Dragon, etc.). ) The average figure and shape are less than 50% of the weight of Tyrannosaurus Rex, while some stout carnivorous dragons (such as Tyrannosaurus Rex and Bud Dragon) weigh only 75%-80% of the same length Tyrannosaurus Rex.

Among carnivorous dinosaurs, only Tyrannosaurus rex and dragon can reach or approach 90% of Tyrannosaurus rex's body mass index.

In addition, the skeleton of Tyrannosaurus rex is also very thick. The growth cycle of Tyrannosaurus rex will end at the age of 19, and will not exceed 2 1 at the latest. When the growth cycle of Tyrannosaurus rex ends, although Tyrannosaurus rex will continue to grow, it will neither grow nor grow tall, and its bones will become thicker and stronger as a whole.