This month's dinosaur is called Pachycephalosaurus (pack-ee-SEF-ah-lah-sore-us), which means “thick-headed lizard.” Because his skull was about eight inches thick, some scientists call him a “bone-headed” dinosaur. He was about 26 feet long and ate plants.
We cannot be sure, but it is likely that he banged his thick head against other Pachycephalosauruses or used it to protect himself from attackers by ramming into them. Bighorn sheep living today decide who is strongest by ramming heads; maybe Pachycephalosaurus did the same. Scientists really know very little for sure about this dinosaur. All they have found is a skull. They can only guess what the rest of the creature looked like. Maybe someday a complete skeleton will be discovered which will teach us more interesting things about him.