Hen Harrier, aka Northern Harrier (<i>Circus hudsonius</i>). I liked this for the strong facial disk capture. Las Gallinas Ponds, San Rafael, California
<ul><li><a href="//commons.wikimedia.org/wiki/File:Northern_(Hen)_Harrier.jpg" title="File:Northern (Hen) Harrier.jpg">Northern_(Hen)_Harrier.jpg</a>: <a rel="nofollow" class="external text" href="https://www.flickr.com/people/9062441@N02">Len Blumin</a> from Mill Valley, California, United States</li>
<li>derivative work: <a href="//commons.wikimedia.org/wiki/User:Toter_Alter_Mann" title="User:Toter Alter Mann">Toter Alter Mann</a> (<a href="//commons.wikimedia.org/wiki/User_talk:Toter_Alter_Mann" title="User talk:Toter Alter Mann"><span class="signature-talk">talk</span></a>)</li></ul>
CC BY 2.0
<ul><li><a href="//commons.wikimedia.org/wiki/File:Northern_(Hen)_Harrier.jpg" title="File:Northern (Hen) Harrier.jpg">Northern_(Hen)_Harrier.jpg</a></li></ul>