Pachycephalosaurus's skull was up to 10 inches thick, but scientists still debate exactly how it was used – whether for head-butting, or perhaps more for flank-butting or display. elaborate
Monolophosaurus had a single, prominent crest on its head, which may have been used for display or species recognition. elaborate
Allosaurus had a unique, S-shaped neck, unlike the straighter necks of many other large theropods. elaborate
Diplodocus had a whip-like tail that it likely used as a sonic boom weapon, cracking it to create loud noises to deter predators or communicate with others. elaborate
Ankylosaurus's tail club could swing with the force of a sledgehammer. elaborate
Microraptor, a four-winged dinosaur, likely had asymmetrical feathers, suggesting it was capable of controlled flight. elaborate