Lesser Black-backed Gull 3CY, May 28 2015, Leiden, the Netherlands.
Arrested moult. Left wing P1-P6 3rd gen, P7-P10 old 2nd gen. Right wing P2 old 2nd gen.
Secondaries old 2nd gen, except for S1, replaced. R5 old 2nd gen, other rectrices 3rd gen, white.
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