Lesser Black-backed Gull sub-adult, June 24 2013, Noordwijk, the Netherlands.
Sub-adult LBBG. Note extensive pattern on greater primary coverts. Small mirror on P10 and scalloped pattern on (almost all) underwing coverts. Distinct adult-like pattern on P3-P5 indicate this bird is older than 3CY.
This bird is now in its complete moult: P1-P2 growing/missing, P3-P10 old.
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