Dimetrodon fan spines
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/51035644987@N01">D'Arcy Norman</a> from Calgary, Canada
CC BY 2.0
<p><a rel="nofollow" class="external text" href="https://www.flickr.com/photos/51035644987@N01/868016748/">Dimetrodon fan spines</a>
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<ul><li>Uploaded by <a href="//commons.wikimedia.org/wiki/User:FunkMonk" title="User:FunkMonk">FunkMonk</a></li></ul>