Regulus calendula If you look very closely you'll see a tiny bit of the ruby-crown on this little fellow's head.  He seldom flashes it and it was years before I got a glimpse of it.  Due to his quick and seemingly nervous movements, this is a difficult bird to photograph.  I was lucky because he came daily to dine on the last of the apples on my backyard apple tree.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/15323831@N05">Linda Tanner</a> from Los Osos, California, U.S.A.
CC BY 2.0
<p><a rel="nofollow" class="external text" href="https://www.flickr.com/photos/15323831@N05/2304707627/">Ruby-Crowned Kinglet</a>
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<ul><li>Uploaded by <a href="//commons.wikimedia.org/wiki/User:Berichard" title="User:Berichard">berichard</a></li></ul>