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These Adult Slaty-backed Gulls (Larus schistisagus) were photographed in Alaska by Tony Leukering:
Gambell, 3rd September (with 2nd-basic Vega Gull); note the almost complete lack of winter markings:

Nome, 4th September; no winter markings visible; note the odd molt stage:- P8 missing and P1 half-grown:

Nome 4th September; note the wing molt stage:- P7 and P8 missing/short; this probable 4th-basic bird has considerable winter streaking - unlike the adult Vega Gull nearby; :