Radde's Accentor <i><a href="//commons.wikimedia.org/wiki/Prunella_ocularis" title="Prunella ocularis">Prunella ocularis</a></i>, adult female, on Mt. Aragats, Armenia.
Sergei V. Drovetski
CC BY 3.0
<a rel="nofollow" class="external text" href="http://onlinelibrary.wiley.com/doi/10.1002/ece3.539/pdf"><i>Ecology &amp; Evolution</i> 3 (6): 1519</a>