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Help ID large gull on Lake of Geneva

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Old Monday 22nd October 2007, 19:20   #1
Widus
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Question Help ID large gull on Lake of Geneva

These pictures were taken last September 22. Large numbers of Yellow-legged Gulls can be seen at this time but I am not sure the bird belongs to this species. Help on the ID would be appreciated.

Widus
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Old Monday 22nd October 2007, 19:31   #2
tim.birdboy
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My goodness those are nice photos! May I ask what camera/lens you use?

Sorry I can't help with the ID! :-\
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Old Monday 22nd October 2007, 20:58   #3
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Hello Widus.

If I put it like this: There´s something not right with this Great Black-backed Gull.

Which means that the bill looks GBBG big, tail pattern looks GBBG like with white, nearly unmarked outer feathers, in other words a tail pattern that would fit some 1st winter GBBG. Tertial pattern HG like with notches and pale edge that reaches the secondaries - could fit some GBBG. The eye looks large for GBBG, the greater coverts a bit to dark usually paler with narrower dark bars.

http://www.pbase.com/stephaubry/image/58856032

The covert moult is not good for 1st winter GBBG at this time, either for Herring Gull, but it is very good for Yellow-legged gull. A male Yellow-legged Gull is the suggestion here albeit with a slightly odd tail pattern, tertial pattern and pale inner primaries.
Nice images!!!

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Old Monday 22nd October 2007, 21:48   #4
lou salomon
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hello,

pale inner primary window: it happens in michahellis that some pale surface extends on outer webs of p1-4 too, but not as extensive as in herring of course. wideness of black band on tail varies also. tertial pattern can be odd as in this, head looks perfect for a 1st winter male type YLG and, as jan said, moult in wing coverts has started which makes it a southerly breeding sp - michahellis.
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Old Monday 22nd October 2007, 22:10   #5
Widus
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Thanks Tim. I use a Nikon D70S with an AF Nikor ED 300 mm lens.
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Old Monday 22nd October 2007, 22:23   #6
Widus
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Thank Jan and Lou for your comments. This was indeed a strange looking YLG ... So now I can rest easy, yet slightly disappointed as GBBG are rarities on our shores!
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Old Monday 22nd October 2007, 22:29   #7
timwootton
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Superb images. I would have gone straight for 1st winter GBBG but, as the learned fellows above state, there's just 'too much happening' regarding the greater coverts for this species (much more subtle barrings) - I therefore assume it's a YLG (having very little experience with this sp.) Lovely bird, anyway and great pics.
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