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October 20 2012
Fossilised skulls of dome-headed dinosaurs retain signs of injuries from violent head butting or head shoving, say US scientists.
The dinosaurs, known as pachycephalosaurs (meaning "thick-headed lizards") have long puzzled paleontologists, who wondered why the heads of these dinosaurs looked to have built-in football helmets.
It's been suspected that dome-headed dinosaurs fought with their heads, but the latest investigation provides some of the most direct evidence for this antagonistic behaviour. | |  |
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