We recently watched a DVD lecture on dinosaurs, can't remember who the paleontologist was who delivered the lecture but he was very entertaining. This guy argued that, contrary to popular belief, the dome-headed pachycephalosaurs (GIS) didn't butt heads because many had ridges and spikes around their skulls and they would run the risk of having their eyes poked out.
This new article argues that perhaps teenage pachycephalosaurs butted heads.
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