Mourning Warbler <i><a href="//commons.wikimedia.org/wiki/Geothlypis_philadelphia" title="Geothlypis philadelphia">Geothlypis philadelphia</a></i>, Tower Grove Park, St. Louis, Missouri. This guy had obviously NOT read the guide books.  He was high (15 m or more) up a Bur Oak tree out in the open, instead of on or near the ground acting secretive.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/80270393@N06">Andy  Reago</a>
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/wildreturn/8358497004/">Mourning Warbler</a>