Two male Ruff at Diergaarde Blijdorp, Netherlands.
<ul><li><a href="//commons.wikimedia.org/wiki/File:Philomachus_pugnax_-Diergaarde_Blijdorp-8c.jpg" title="File:Philomachus pugnax -Diergaarde Blijdorp-8c.jpg">Philomachus_pugnax_-Diergaarde_Blijdorp-8c.jpg</a>: <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/46956042@N00">Arjan Haverkamp</a></li>
<li>derivative work: <a href="//commons.wikimedia.org/wiki/User:Bff" title="User:Bff">Bff</a></li></ul>
CC BY 2.0
<ul><li><a href="//commons.wikimedia.org/wiki/File:Philomachus_pugnax_-Diergaarde_Blijdorp-8c.jpg" title="File:Philomachus pugnax -Diergaarde Blijdorp-8c.jpg">Philomachus_pugnax_-Diergaarde_Blijdorp-8c.jpg</a></li></ul>