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Check internet "Immature lesser Black-backed gulls photograph" in Google. 
Surfbirds.com put up the first reference Bird I.D. with article by Peter 
Adiaens and the next was a Disussion on Aging by Brian J. Small with some 
good transitional photos of second year LBBG.
Mariel Stephenson
Columbia,  Boone County, MO
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----- Original Message ----- 
From: "Michael & Jo Ellen Thelen" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Saturday, December 17, 2005 11:33 PM
Subject: Riverlands Today


> Report for Saturday, December 17, 2005
>
>
> I birded Riverlands Migratory Bird Sanctuary in St. Charles County
> today.  Counted 60 TRUMPETER SWANs, including one in Heron Pond having a
> strange bill tip that I'm not sure was mud or a deformity.  Even though
> the bird was constantly dipping its head in the water, the tip didn't
> change.
>
>
> Watched a juvenile COOPER'S HAWK bathe in the Illinois hwy 143 slough,
> near GADWALL and MALLARD.  Only about 10 BALD EAGLEs in the area.  13
> species of duck included AMERICAN BLACK DUCK, NORTHERN PINTAIL,
> READHEAD, and GREATER SCAUP at the dam spillway.
>
>
> Many gulls to look at, mostly RING-BILLED GULL.  Some HERRING GULL
> present, of all ages.  Two dark-backed gulls were challenging.  One
> appeared to be an adult, or near adult, LESSER BLACK-BACKED GULL,
> perched on the lock wall (Illinois side).  It had a medium-gray back; a
> dark, streaky eye-mask; yellow bill with red gonys spot; very pale
> yellow legs.
>
>
> The second individual I'm struggling with and would appreciate any
> comments.  The bird was about the same size, possibly marginally bigger,
> as the two Herring Gulls on each side of it; it had a black bill tipped
> white; a broad solid black tail band, contrasting cleanly with a white
> rump; in flight a very dark upper wing, with the primaries darker than
> the inner wing, and no apparent window as expected on a Herring, and
> dark, contrasty secondary bars; a dark, slaty-gray  -- almost dark
> bluish -- mantle.  I saw the bird in Ellis Bay near Wise Rd. (Missouri
> side), and watched it fly downstream to almost the dam.  The field marks
> don't seem to add up to Great Black-backed Gull, and I shrink to even
> suggest Western Gull.  The photos are labeled "large gull."
>
>
> Photos here:
>
> http://www.smugmug.com/gallery/1048592
>
>
> Mike Thelen
> St. Louis County, MO
> [log in to unmask]
>
>
> More photos:
>
> http://www.fieldguides.com/emailing2005_10a.htm
> http://mobirds.org/Galleries/MThelen.asp
> http://www.surfbirds.com/albums/index.php?cat=10120
> http://photos.yahoo.com/mikethelen3000
>
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*              Audubon Society of Missouri's              *
*                Wild Bird Discussion Forum               *
*---------------------------------------------------------*
* To subscribe or unsubscribe, click here:                *
* https://po.missouri.edu/cgi-bin/wa?SUBED1=mobirds-l&A=1 *
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* To access the list archives, click here:                *
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* To access the Audubon Society of Missouri Web           *
* Site:  http://mobirds.org                               *
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