<i><a href="//commons.wikimedia.org/wiki/Triceratops" title="Triceratops">Triceratops</a></i> skull cast in the entrance to the <a href="//commons.wikimedia.org/wiki/Smithsonian" class="mw-redirect" title="Smithsonian">Smithsonian</a> <a href="//commons.wikimedia.org/wiki/National_Museum_of_Natural_History" class="mw-redirect" title="National Museum of Natural History">National Museum of Natural History</a>, <a href="//commons.wikimedia.org/wiki/Washington_DC" class="mw-redirect" title="Washington DC">Washington DC</a>, <a href="//commons.wikimedia.org/wiki/United_States" title="United States">United States</a>
Source: <a rel="nofollow" class="external text" href="https://www.flickr.com/people/10386854@N04">sabreguy29</a> from Alexandria, VA, USA <br> Derivative and graphic processing: <a href="//commons.wikimedia.org/wiki/User:MathKnight" title="User:MathKnight">User:MathKnight</a>
CC BY 4.0
<a href="//commons.wikimedia.org/wiki/File:Triceratops_(1020440116).jpg" title="File:Triceratops (1020440116).jpg">File:Triceratops (1020440116).jpg</a>