An interesting juvenile Herring/Yellow-legged Gull


1cy Herring Gull(?) showing some characters recalling michahellis. Nokia Koukku dump, SW Finland 2.8.2007. Foto: Hannu Koskinen


Black bill against white feathering, dark eye mask,,,good for michahellis? Nokia Koukku dump, SW Finland 2.8.2007. Foto: Hannu Koskinen


At least 8 scapular/mantle feathers already moulted on the right side.
Some <0.5% of juvenile Finnish argentatus do replace a few scapulars already in late July. Nokia Koukku dump, SW Finland 2.8.2007.
Foto: Hannu Koskinen


However, after all the strucure of this Gull is more like as argentatus. Nokia Koukku dump, SW Finland 2.8.2007. Foto: Hannu Koskinen


The underwing pattern and tail is ok for michahellis (but will do in argentatus also).
Nokia Koukku dump, SW Finland 2.8.2007. Foto: Hannu Koskinen


But the inner primaries (="window") are too pale, like the overall upperparts as well for a true michahellis.
So, it's just an interesting argentatus (left). Nokia Koukku dump, SW Finland 2.8.2007. Foto: Hannu Koskinen