http://www.bbc.co.uk/news/science-environment-13968525
Scientists have compared a dinosaur with several modern-day animals to settle who wins the heavy-weight head-butting title.
The new findings confirm that the ancient bipedal dinosaur Stegoceras could knock out any of today's top head-butters.
Stegoceras probably used their domed skulls to ram each other over access to fertile females.
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