Lesser Black-backed Gull 3CY, May 29 2017, Heemskerk, the Netherlands.
Bird returned from wintering grounds with arrested moult in primaries. Right wing current situation: P1 missing (may have been old 2nd gen, now shed in complete moult), P2-P6 3rd gen replaced last winter, P7-P10 old 2nd gen. Left wing: P1 old 3rd gen, P2 missing, P3 old 2nd gen, P4-P6 3rd gen replaced last winter, P7-P10 old 2nd gen. All secondaries replaced as well last winter, now 3rd gen.
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