Thayer's-type Gull- Marquette, Michigan

[David Pavlik]

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Gull enthusiasts,

This gull was seen and photographed for 2 days in Marquette, Michigan. I initially called it a Thayer's as it was dark, dark primaries, dark secondary bar and complete solid tail band. The tertials are solid, however there is a bit of checkering on them and the bird is more checkered overall. Also, the bill size has come up in conversation as well. I still think this bird could be within the range of Thayer's, but thought some of you could throw out some opinions.

http://pavlikphotography.com/fall-2009-winter-2010-gulls/thayers-gull-10-17-09.htm

Any thought would be appreciated,
Thanks!
David Pavlik

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[Glenn d'Entremont]

Here on the north east coast I would initially call this a Thayer's.  However, the head appears too small and rounded and the bill seems short.  Even though the primaries have "J" hooks, the contrast is not great as the primaries appear grayish, not brownish.  The upperparts might be too frosty.  I expect the west coast responses to claim this bird too pale and small headed and the secondary bar not strong enough.

This bird appears consistant with images 263 and 292 in Gulls of North America, Europe and Asia (Olson & Larrson), noting 292's caption is "1st winter Thayer's or Kumlien's Gull.  A tricky individual...."  It is also consistant with images 35A.12 and 35A.35, gull 35 being Kumlien's, in Gulls of the Americas (Howell and Dunn).

Glenn

Glenn d'Entremont:  gdentremont1@...  Stoughton, MA

----- Original Message -----
From: "David Pavlik" <dtpavlik@...>
To: BIRDWG01@...
Sent: Sunday, October 18, 2009 7:00:12 PM (GMT-0500) Auto-Detected
Subject: [BIRDWG01] Thayer's-type Gull- Marquette, Michigan

Gull enthusiasts,

This gull was seen and photographed for 2 days in Marquette, Michigan. I initially called it a Thayer's as it was dark, dark primaries, dark secondary bar and complete solid tail band. The tertials are solid, however there is a bit of checkering on them and the bird is more checkered overall. Also, the bill size has come up in conversation as well. I still think this bird could be within the range of Thayer's, but thought some of you could throw out some opinions.

http://pavlikphotography.com/fall-2009-winter-2010-gulls/thayers-gull-10-17-09.htm 

Any thought would be appreciated,
Thanks!
David Pavlik


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[Steve Hampton]

In California we'd call that a Thayer's Gull for sure.  Yeah, it's SLIGHTLY pale in the primaries and bill, but I'd call that well within range of Thayer's (based on nothing scientific other than my hunch about natural variation).  

  Steve Hampton
Davis, Ca








Subject: Thayer's-type Gull- Marquette, Michigan
From: David Pavlik <dtpavlik AT HOTMAIL.COM>
Date: Sun, 18 Oct 2009 19:00:12 -0400

Gull enthusiasts,

This gull was seen and photographed for 2 days in Marquette, Michigan. I
initially called it a Thayer's as it was dark, dark primaries, dark secondary
bar and complete solid tail band. The tertials are solid, however there is a
bit of checkering on them and the bird is more checkered overall. Also, the
bill size has come up in conversation as well. I still think this bird could be
within the range of Thayer's, but thought some of you could throw out some
opinions.



http://pavlikphotography.com/fall-2009-winter-2010-gulls/thayers-gull-10-17-09.htm 


Any thought would be appreciated,
Thanks!
David Pavlik


Steve Hampton
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Office of Spill Prevention and Response
California Dept of Fish and Game
PO Box 944209
Sacramento, CA 94244-2090
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