scinewscom:Miocene Giraffe Had Disk-Shaped Headgear and Head-Neck Joints Adapted for Head-Butting Co
scinewscom:Miocene Giraffe Had Disk-Shaped Headgear and Head-Neck Joints Adapted for Head-Butting Combathttp://www.sci-news.com/paleontology/discokeryx-xiezhi-10868.html Pachycephaloraffes! -- source link