Labels:text OCR: THICK HEAD PROTECTIVE BONE This is the skull of an The tiny brain was adult Pachycephalosaurus. buried deep within a The dome is more than solid mass of bone. 20 cm (8 in) thick. SKUL NAVIGATOR Bony nodules SPIKY NOSE the back of t TRACKER DINO ONLINE Bony spikes projected up from the snout. DOMED SKULL