I can't be sure without a colour ring, but I think that this Herring Gull has crossed the North Sea for its winter break in Musselburgh. The steel-like grey upperpart tone combined with reduced black in their outer primaries are pointers to the identification of Scandinavian Herring Gulls. Another bird at Seafield this morning was darker grey and had thayeri-like wingtip pattern - that's a classic combination for a northern argentatus. This one is slightly trickier on both counts, so maybe its origins are slightly less far north?
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