Triceratops’ enormous head might have been all it took to send other dinosaurs running—some recovered skulls ... these horns was a head frill made of bone and studded with small spikes called ...

The top of a Pachycephalosaurus skull could be 9 inches (23 centimeters) thick, and much of the skull and the snout were also covered by small bony ... like the large horns and antlers of some ...

With the new skull acquired by the College of Surgeons, and apparently belonging to the same animal as the skin, is a pair of small ossicones, not yet ankylosed to the skull, measuring about 2 in.