But new analysis of fossil remains of the beasts, collectively known as pachycephalosaurs (pronounced pak-ee-SEFF-uh-low-sores), shows that head-butting of the kind popularized in lay books on dinosaurs probably would have been suicidal.
The researchers suggest that pachycephalosaurs might have gently nudged heads in a kind of love tap.
They compared them to dozens of fossils from related species found in Canada and Montana before confirming that the fossils represented a new genus of pachycephalosaur, a group of bipedal, thick-skulled dinosaurs.
The plates on Stegosaurus and the fleshy, domed skulls on pachycephalosaurs could certainly have been for recognition, but not the kind of recognition cited in the article comparing it to teen fashion ("Just for Frills?
Tyrannosaurids are one of many dinosaur groups that exhibited trans-Laurasian (or at least Asian and North American) distributions during the Late Cretaceous; others include ceratopsians, hadrosaurs, and pachycephalosaurs (e.