Male Brown-headed Cowbirds in Ontario, Canada. When males sing, they often raise their back and chest feathers, lift their wings and spread their tail feathers, and then bow forward. Groups of males may do this together.
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/58575431@N00">Matt MacGillivray</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://www.flickr.com/photos/58575431@N00/3479828040">bachelors?</a>