is it l. marinus?

[Michal Sindel]

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

[Cristian Mihai]

Yes, it is.

[Albert de Jong]

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

[Michal Sindel]

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

[adriaens]

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.