The Greater Roadrunner (Geococcyx californianus) has black skin and when it is cold, it ruffles it's feathers to expose the skin which absorbs solar energy as heat. This Bird was observed in the Colorado Desert in Imperial county, California.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/32541690@N02">Alan Vernon</a>
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<a href="//commons.wikimedia.org/wiki/Flickr" class="mw-redirect" title="Flickr">Flickr</a>: <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/32541690@N02/5510853592">Greater Roadrunner sunning and making a fuss....2 of 2 in set</a>