When did these blockhead dinosaurs get their domes? A new fossil is “the specimen we have all been waiting for.” In this artist's reconstruction, two pachycephalosaurs from the new species Zavacephale ...

A newly discovered raptor had a knobby bump on its head, suggesting that, like some larger dinosaurs, it engaged in competitive head bashing. By Jack Tamisiea Head-butting was all the rage at the end ...