They may have been plant-eaters, but stegosaurs were no easy prey: Researchers have found the fossil remains of what might be a deadly wound inflicted by the creature's spiked tail. Stegosaur tails have been a matter of some debate. While paleontologists used to say they were only for decoration, recent studies have suggested that the spiked, dexterous tails were actually used in combat. In 2005, researchers reported that a non-fatal wound found in the fossil of an allosaur -- a fearsome predator of stegosaurus's age -- was most likely inflicted by a stegosaur tail. But it turns out that those...