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Billede:


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Billede information:
Fugleart: Inuitmåge - (Larus thayeri) - Thayer's Gull
Fugleart (IOC): Inuitmåge (Larus thayeri) Thayer's Gull - species factsheet
Stemme: Stemmer findes her (eksternt link).
Titel / info: 4cy or 5cy
Lokalitet: Skopun/Sandoy, Færøerne
Dato: 22. februar 2012
Billede opsætning: Nikon D300
Fotograf: Rodmund á Kelduni, Færøerne
Del af temaet: Tvivl om bestemmelsen?
Uploadet den: 23. februar 2012
Hits: Billedet har været vist 2177 gange.



Kommentarer:

Josh Rhys Jones skriver torsdag 23. februar 2012 kl. 16.18
This is surely a Kumlien's Gull. The primaries look dark grey, not black?


Jan Fischer Rasmussen skriver torsdag 23. februar 2012 kl. 16.22
To me they look bright blue...


Sebastian Klein skriver torsdag 23. februar 2012 kl. 16.26
I agree with Josh. The primaires aren't black and it shouldn't be labelled Thayer's Gull.
The primaries of what I presume is the same bird can also be viewed here: http://www.netfugl.dk/pictures.php?id=showpicture&picture_id=46811


Rodmund á Kelduni skriver torsdag 23. februar 2012 kl. 16.54
Well i disagree, compare mantel color of the dark gull to the adult Icland Gull, show me a Kumlien´s Gull with sutch a dark mantle color, further more the bill is quite heavy, and last but importently, no litrature state that Kumlien´s Gull have/can have a subterminalband on p10, if you brows thru photos of Thayer´s Gull on the net, you will find a lot of photos that matches the markings seen on this induvidual.

To Sebastian, i cood have labeld the bird gull sp. but there is deffenilty very strong Thayer´s Gull feetures in it, and since all littrature i have been across do not mention Kumlien´s Gulls with a subterminalband on p10 i will not call this gull a Kumlien´s Gull.


Sebastian Klein skriver torsdag 23. februar 2012 kl. 17.50
Hi Rodmund

You've got a point with the subterminalband (see http://www.netfugl.dk/pictures.php?id=showpicture&picture_id=46811). That is not normal for a Kumliens. But the colour of the dark markings on the primaries doesn't support Thayers-IID.
Were the primaries really black (and just seem greyish on the photo)? Or do you think it is a Thayer's Gull with greyish primaries? Or are you (like me and a few others) just very puzzled about the generel appearance of quite a few gulls this winter?


Rodmund á Kelduni skriver torsdag 23. februar 2012 kl. 22.25
If we thake the mantle color, bill, subterminalband on p10 and structure of this gull, it says Thayer´s Gull.

But when we take the coloring of the primaries it may perhaps not fit Thayer´s Gull entierly.

The outer web on the primaries were black while the inner web were gray, but when it come´s to the subterminalbands they vere not all black, the subterminalband on p10 was black, on p9 it was more dark gray but with a black "frame", p8 was gray with a marginal thin black "frame", the subterminalband on p7 was black on the "outer web" but gray on it´s "inner web" and the markings on p6 were gray.

However, there are more Thayer´s feetures on this gull than Kumliens feetures.

I had a 2cy at Skálafjørður/Eysturoy, Faroe Island, 08.03.2009, http://www.netfugl.dk/pictures.php?id=showpicture&picture_id=25975 it was not accepted as a safe Thayer´s Gull but as a Thayer´s/Kumlien´s Gull.

This Gull may or may not be accepted as a Thayer´s Gull but then it surly is a Thayer´s Gull x Kumlien´s Gull.




Josh Rhys Jones skriver tirsdag 28. februar 2012 kl. 16.40
Here is a similar dark Kumlien's Gull from Ontario.

https://picasaweb.google.com/117329578255897846071/KumlienSThayerSGullsFromONTARIO#5577274574981870258



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