<p>This White Pelican (Pelecanus erythrorhynchos) is in its alternate (breeding) plumage with three distinct bill horns.  These growths on the bill will disappear after the mating period once the eggs have been laid.  
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Observed flying over the Salton Sea, California.
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/32541690@N02">Alan Vernon</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/32541690@N02/4442360006">Mature white Pelican in flight</a>