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Hi,
its my first post so i want to say hello to every one! I read these forum from almost begginig but just i decided to write some post.
I would like to compare with you a some interesting gull which one we have distinguish as 2CY michahellis (with lot of help from Grzegorz N. which is on forum).
Photo was taken 7 november at small dump near Warsaw in Poland (not Lubna).
Any comments are welcome.

Michal

The base colour in the fresh feathers seems to be very dark for a typical michahellis.
It looks to be a strong bird, looking like a marinus, with a high based bill.
I find it difficult to say this is for certain a michahellis.

Theo

A strange looking (retarded) 2cy michahellis, 2cy at least by pale eye, rounded primarytips and tetials - with such a heavy bill and dark grey feathers.
Agree with Theo that there´s some GBBG jizz to it, but...
No doubt, someone would clear the way

Actually, it does not look entirely typical for Great Black-backed Gull either, since its body looks slim with elongated rear-end, the outer primaries lack whitish tips or edges, and many wing-coverts and scapulars look quite brown.
I have no firm opinion on this bird...