Here's the propper link to the page I linked before, incorrectly:

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

Subject: Comparisons with other GBBGs
From: "Ryan Shaw" <rtshaw80 AT hotmail.com>
Date: Tue, 20 Jan 2004 16:22:10 -0800

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.html

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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