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About Centrosaurus:
It was probably too dumb to notice the difference, but Centrosaurus was definitely lacking when it came to defensive armament: this ceratopsian had only a single long horn, compared to three for Triceratops and five for Pentaceratops. Like others of its breed, Centrosaurus' horn and large frill probably served dual purposes: the frill as a sexual display and (possibly) a way to dissipate heat, and the horn to head-butt other Centrosauruses and intimidate hungry carnivores.
Recently, paleontologists announced a pair of new ceratopsians that seem to have been closely related to Centrosaurus, the North American Diabloceratops and Medusaceratops--both of which had unique horn/frill combinations reminiscent of their more famous cousin (hence their classification as "centrosaurine" dinosaurs, albeit ones with very Triceratops-like characteristics as well).
