If you look at the skeleton of the flesh-eating dinosaur called Carnotaurus, two features instantly stand out: the skull and the arms. The fearsome skull is short, deep and topped by two devilish horns. Hence, its name: “meat-eating bull”. The arms are much less fearsome – they’re so short that they make Tyrannosaurus’s stunted fore-limbs looks like those of a wrestler. These body parts are distinctive, but Scott Persons and Phillip Currie from the University of Alberta think that the most interesting parts of Carnotaurus are its hips and tail.

By reconstructing the meat-eating bull’s hindquarters, Persons and Currie have found evidence that this dinosaur was much faster than anyone had thought. Powered by an enormous tail