An article published in the journal “PLOS ONE” reports a study on the locomotion capabilities of the dinosaurs of the theropod group, and in particular of more than 70 species belonging to the carnivorous groups Tyrannosauridae, which includes T. rex, Allosauroidea and Ceratosauridae. A team of researchers considered various physical characteristics to evaluate the allometry impact on those dinosaurs’ ability to run and the limiting effect of their size, aspects that are generally overlooked. One conclusion is that large predators such as T. rex had the advantage of efficiency thanks to their long legs, not of speed as previously thought.