California Gull in flight, displaying its flight feather moult.
Mix of grey and brown upperparts are largely 1st alternate (breeding plumage).
The inner 4 primaries (p1-4) are 2nd cycle, with p5 and p6 growing; p7 is shed or not visible. Primary coverts are also being replaced in similar sequence.
Secondary moult has also commenced, with s1 growing, well after start of primary moult.
(Vancouver BC, August 2 2025)
Immature California Gull moulting flight feathers.
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