Bone Heads? — the Behaviour of Dinocephalians
The dinocephalians were probably not the brightest of creatures (their brain was the one part that didn't get bigger). But, here we mean 'bone heads' quite literally. Although most
noticeable in later dinocephalians, all of these animals featured pachyostosis — a great thickening of the bones on the top of the skull which increased as the animal grew into
adulthood. We suspect that these animals engaged in head-butting contests because of the arrangement of their skull bones. Tremendously thick, the dino- cephalians' skulls would also
transfer impact forces directly to their sturdy neck vertebrae and powerful muscles [see below]. These dinocephalian jousts would have been relatively sedate affairs — more of a
pushing contest, really. The dinocephalians could not have matched the agility of modern head-butters such as Big Horn Sheep. Thats the trouble with being a Bone Head —
there's just not a lot of room left in that thick skull for brains!