Australian Koel <i>Eudynamys cyanocephala cyanocephala</i>, Brush Wattlebird <i>Anthochaera chrysoptera chrysoptera</i>. Like many other cuckoos, the Koel lays its eggs in another bird's nest and leaves them to raise its chick. This big baby meant a lot of work for the wattlebirds.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/71589894@N00">Marj Kibby</a> from Newcastle, Australia
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/71589894@N00/475155642/">Koel and its wattlebird fosterparent</a>