The bony plates of the stegosaurus make for a frightening display, deterring predators. However, it is the spikes on its tail that make for a deadly weapon to fend of attacking predators.
The distinctive head crest of the parasaurolophus allows it to make a deep call which travel great distances to warn other members of the herd of potential danger, giving members sufficient time to escape.
The ankylosaurus was a walking tank, covered with tough armor made of bone and cartilage. Coupled with a club at the end of its tail, the ankylosaurus was a herbivore not to be taken lightly!