Blue tit, Cyanistes caeruleus, foraging in the foliage. It is still in moulting, so it is a young bird. The head has not yet received all its white feathers.
<a href="//commons.wikimedia.org/wiki/User:Sw3dPix" class="mw-redirect" title="User:Sw3dPix">Sw3dPix</a>
<span class="int-own-work" lang="en">Own work</span>