Did a little surfing, found several immature Great Black-backed Gulls on the
net with almost the exact same head/bill structure as the Renton bird.
Take a look at the two immy's on the bottom of this page, even though their
ages are labeled incorrectly.

http://gullpage.tripod.com/gullspage_en/id12.htm

The adult on the bottom of this page even shows the same head/eye/bill
structure:

http://www3.sympatico.ca/jeaniron/Gulls04.html

Compare with Denny's shot at:

http://osprey.bardill.net/gallery/album10/P1170055a

cheers
Ryan Shaw

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