This skull is a cast of a famous pachycephalosaurus skeleton.  Our exhibit is one of only a few copies in the world of this important specimen. This fossil, field named “Sandy”, was the most complete pachycephalosaurus skeleton known from the fossil record. In addition, this skeleton was more than 50% complete with all areas of the skeleton being represented. The skull for this skeleton, is one of only six known complete pachycephalosaurus heads found (there have been many knobs, or quadrates, of the pachycephalosaurus skull found, but they are usually very incomplete). This one was more than 65% complete, and is the first skull with significant neck vertabrae. These vertabrae were researched and shown to be too weak for the pachycephalosaurus to use this thick skull as a battering ram (as portrayed in Jurasic Park 2: The Lost World).