Lesser Black-backed Gull 2CY, May 29 2017, Heemskerk, the Netherlands.
Bird is not ringed, no provenance on origin. Intermedius-type 2CY bird.
With advanced post-juvenile moult in late winter, prior to northbound migration. All feather tracts included, except for the primaries. Outer rectrices and outer secondaries still juvenile.
Complete moult just started: P1-P2 missing.
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