The Tyrannosaurus Rex, about 68.5 million to 65 million years ago, is one of the most extinct dinosaurs in the United States and Canada in North America. The body length is about 11.5-14.7 meters, and the head height is nearly 6 meters. The average weight is about 9 tons, the heaviest is 14.85 tons, and the head length is about 1.55 meters. It is also the most sturdy carnivorous dinosaur. On May 18, 2019, the dinosaur skeleton replica of the world’s largest Tyrannosaurus Rex “Scotti” was exhibited in Saskatchewan, Canada. It is 13 meters long and weighed 8.8 tons before birth, which is heavier than the largest tyrannosaurus considered before.