>>32083541this has been disproven as they had air pockets filled with spongy material in their skulls that acted as natural shock absorbers this is one of those things that gets proven and disproven over and over but you dont evolve a skull like that just for show. Granted if they where to smash into each others heads from a running start yeh they would hurt themselves its more likely they shoved or smacked each others flanks as rituals for mates or something to that matter.