Eurasian Crag Martins perching on a rocky surface in Europe.
<a rel="nofollow" class="external text" href="https://flickr.com/people/28820410@N03">Martien Brand</a>
CC BY 2.0
originally posted to <b><a href="//commons.wikimedia.org/wiki/Flickr" class="mw-redirect" title="Flickr">Flickr</a></b> as <a rel="nofollow" class="external text" href="https://flickr.com/photos/28820410@N03/3321441337">24003 Rotszwaluw / Crag Martin</a>