initially, went with Elegant Tern (the shaggy crest, paler bill tip &amp; black on head extending forward around eye), but was told by a credible source that it was a Royal Tern - white crown, heftier bill (I guess both can have shaggy crests and paler bill tips)
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/38621030@N07">Dawn Beattie</a> from Morro Bay, CA, USA
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/pics4dawn/8076323331/">Royal Tern (sterna maxima)</a>