A <b>Blue Tit</b> (<i>Parus caeruleus</i>) approaching its nest behind a vent grille to feed the chicks.
<a href="//commons.wikimedia.org/wiki/User:Oskila" title="User:Oskila">Oskila</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>