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Hello,
please, can you help me with identification of this gull. I think it is l. marinus. But I cannot exclude l. artentatus, because the tail bar during fly, wasnt typically diffuse (if I saw it good in short time).
Thank you

Yes, it is.

The size fits better for marinus indeed, but the bill is better for argentatus. Why are you sure, Christian?

Hello,
I did new photos yesterday with piece of bar tail from upper side, and whole bar from under side. Now I think it is clean marinus, or no?
Thank you

Hi Michal,

this is a difficult individual, hence the general lack of response, I guess.
To me, the bill shape (lacking the very blunt tip of Great Black-backed) and rather pale brown colour of the markings on upperparts and wing coverts suggest an odd Herring Gull rather than Great Black-backed.
With these photos though, I doubt you will get a definite answer.
It would probably be better to have a look at this bird in flight, and perhaps even take a photograph or two of the stretched wing. The pattern of the inner primaries should make identification a lot easier.