<p>Hypothetical head-to-body interactions among pachycephalosaurids.
</p>
Giraffa-style necking and parietal clashing in high-domed and large-horned specimens such as subadult Pachycephalosaurus (“Stygimoloch” and “Dracorex”).
Ryan Steiskal
CC BY 2.5
<a rel="nofollow" class="external free" href="http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0068620">http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0068620</a>