Behold! The punctured vertebrae #Dinosaur #Fossil of an #Allosaurus caused by the #Thagomizer of a #Stegosaurus. The spikes (seen to illustrate fit) were used for defense. The thagomized allosaurus survived as evidenced by healed bone. #Science #PaleoSky See: www.researchgate.net/publication/...

Sometimes I mourn for Thag, of #Thagomizer fame. poor fellow.