In spring the Double-crested Cormorant develops crests, which are sometimes white. And in the right light we can see that there feathers are not all black, but rather show a distinct shingled gray design. Rodeo Lagoon, Marin Headlands.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/9062441@N02">Len Blumin</a>
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<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/9062441@N02/2094069714/">Double-crested Cormorant</a>