At the twilight of the age of dinosaurs, an agile and vicious predator named Nanotyrannus prowled western North America, resembling a smaller version of Tyrannosaurus – about a tenth the body mass – but with several key anatomical differences.
That is the finding of new research concluding that Nanotyrannus – which for years has been at the center of a debate among paleontologists as to whether it was merely a
