(2
images) Herring
Gulls 2cy (argenteus), April 20 2002, Boulogne/Mer,
France (50.42N,1.34E).
In the top image: a 2cy argenteus with still all primaries juvenile by April 20. However, many 2cy argenteus start the complete moult in the last decade of April, and it's not difficult to find birds missing P1, P2 or even P3.
In the image below: a 2cy bird, which has dropped P1.
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