Lesser Black-backed Gull sub-adult, June 24 2013, Noordwijk, the Netherlands.
Two sub-adult LBBG. Note extensive pattern on secondaries, and large dark markings on greater primary coverts. Small or no mirror on P10. Distinct adult-like pattern on P3-P5 (and P4-P5 in lower bird) indicate these birds are older than 3CY.
These birds are now in the complete moult: P1-P2 growing/missing, P3-P10 old (lower bird: P4-P10 old).
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