Lesser Black-backed Gull 3cy, June 10 2013, Noordwijk, the Netherlands.
Complete moult started P1-P2 missing/growing. Secondaries old 2nd gen, but 3 secondaries replaced for 3rd gen feathers, also all tail-feathers replaced on winter grounds. Together with tail, also about 75% of (inner) wing-covert panel and upper tertials replaced in winter/early spring. New coverts and tertials very adult-like.
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