Do you know how big the ancestors of Tyrannosaurus rex were? On July 13, 1947, a batch of dinosaur fossils was discovered in the United States, and through the study of this batch of dinosaur fossils, it was found that these dinosaurs lived in 2

Do you know how big the ancestors of Tyrannosaurus rex were?

July 13, 1947 A batch of dinosaur fossils were found in the United States, through the study of this batch of dinosaur fossils, it was found that these dinosaurs lived on the American continent 200 million years ago, this dinosaur has no name, characterized by small and fierce carnivores, their body size is 3-4 feet long, larger than a chicken, smaller than a horse, after research, they are the ancestors of the 40-ton Tyrannosaurus rex that wandered on the earth 100 million years later.

Is it a genetic mutation!!!!!