Note the "apical spots" on p2-p4, in comparison to 1cy Caspian Gulls |
Note especially in the video hove fare the primaries project beyond tail compared to same aged argentatus and please also note that the exposed primaries are jet black whereas argentatus has a more brownish wash to it.
The juvenile plumage is quite worn and the moult is rather progressed compared to same aged argentatus with most of the mantle, lower scapulars and even a few wing coverts being renewed. Such advancement in moult is a classical michahellis feature.
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