Use of a crocodile and chickens are born who confirmed the model, Hutchinson and Garcia on the tyrannosaurus rex (Tyrannosaurus rex) is able to run the controversial issue was studied. Literature, the estimated maximum speed of the Tyrannosaurus vary from walking speed to 11 meters per second, and then to the running speed of 20 meters per second, there. According to extensor muscles on the fast run the minimum number required to estimate the results of the new projections made that Tyrannosaurus rex and other large dinosaurs could not run the.