Some dinosaurs have undergone quite radical image changes over the years – sauropods moved out of their swamps and got into shape and theropods went from blundering tail draggers to sleek, deadly (and quite horizontal) predators – some of then even gained feathers. It might be tempting to presume, however, that Stegosaurus has remained much the same – slow, stupid and stacked with plates like a big reptilian dishwasher.