File:Pachycephalosauridae head butting.png

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current | 15:48, 9 January 2014 | ![]() | 997 × 1,591 (1.34 MB) | IJReid | {{subst:Upload marker added by en.wp UW}} {{Information |Description = {{en|Hypothetical head-to-head interactions among pachycephalosaurids. (A) Bison-like head-shoving in large, broad-domed specimens such as Pachycephalosaurus wyomingensis; (B) Ovis-... |
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