Dome-skulled Dinos Went Head-to-head (IMAGE) University of Alberta Caption Fossil evidence and computer simulations show which pachycephalosaurs could butt heads. Credit Photo illustration by Chris Kriegner and Tetsuto Miyashita Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.