North American Porcupine <i><a href="//commons.wikimedia.org/wiki/Erethizon_dorsatum" title="Erethizon dorsatum">Erethizon dorsatum</a></i>, Loyalsock State Forest, Wallis Run, Pennsylvania, USA.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/79666107@N00">Chris M</a>
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/79666107@N00/6299991648/">North American Porcupine</a>