Lesser Black-backed Gull 3CY, June 29 2017, Utrecht, the Netherlands.
Arrested moult:
Left wing P1 growing, P2-P3 missing, P4-P6 old 3rd gen, P7-P10 old 2nd gen.
Right wing:
P1-P2 missing, P3-P4 old 3rd gen, P5 old 2nd gen, P6 old 3rd gen, P7-P10 old 2nd gen.
All secondaries 3rd gen, and all rectrices 3rd gen-type as well.
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