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|Larus sp. (Larus sp.) Gulls, Terns and Skimmers (Laridae)|
2021-11-27 Dragør Sydstrand, Amager, Denmark
First calendar year. From the distance I was hoping this dark bird would be a young lesser black-backed gull, lbbg, and the only reason why I now have to say, it is not, is the obviously too bright primary window that simply can't be found on a pure lbbg, as far as I know.
The fact that the bird is still mostly in juvenile plumage and the fact that the few second generation scapulars look very good for a lbbg, as well as the pattern of the tertials, could then indicate a bird of mixed genes. Could this be a hybrid Lesser Black-backed x Herring? The rather compact profile of the bird and the paling of the base of the bill could be caused by a Herring parent.
I was also speculating whether it could a hybrid with Caspian involved, but would, no matter what, have expected a more progressed molt pattern than seen here.