Lesser Black-backed Gull 2CY, June 18 2017, Utrecht, the Netherlands.
Bird not ringed, no provenance on origin. Intermedius type 2CY bird.
Advanced post-juvenile moult on the wintering grounds. All scaps and wing-coverts (except outermost LC and GC) replaced, as well all the tertials. Moult continued in rectrices and inner secondaries. Outer secondaries and (probably all) primaries remained juvenile. 2nd gen feathers most with simple pattern, or actually hardly any pattern, just a darker shaft streak.
Bird migrated north in spring and now complete moult started: P1/P4, P1 growing.
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