<i>Sitta europaea caesia</i>, a subspecies of Eurasian Nuthatch (<i>Sitta europea</i>)
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/44939325@N02">Maarten Visser</a> from Capelle aan den IJssel, Nederland
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/44939325@N02/5208510001/">Boomklever (<i>Sitta europea</i>)</a>