One day, a long time ago, a #Stegosaurus got really pissed off at an #Allosaurus and swung its tail spikes, striking the Allosaurus in a tail vertebra. We don't know if ally was attempting to eat steggy, or if steggy was upset by the presence of ally, or if steggy was just grumpy that day and hadn't had his or her coffee, but we do know that the Allosaurus survived based off of bone growth after the wound. Fossil on display at the USU Prehistoric Museum in Price, Utah. #ThyreophoranThursday / #ThagomizerThursday / #ScienceThursday #paleontology #science #usofscience #fossil #fossils #biology #zoology #bird #reptile #animal #animals #geology #dinosaur #dino #dinos #dinosaurs #naturalhistory #museum #naturalhistorymuseum #ClevelandLloydDinosaurQuarry #cldq #utah