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These four 1st-alternate/2nd-basic Slaty-backed Gulls (Larus schistisagus) were photographed at Gambell, Alaska by Tony Leukering on 4th September, 1999. It is interesting to note that on all three non-flying birds there is the indication that the row of scaps sitting just above the lesser wing -coverts are the darkest part of the "new" upperparts feathering:

This bird has a much more advanced molt of the wing-coverts, and its primary molt is about one full primary ahead of the above birds; also note that the tail appears to have a paler basal band:

note the odd molt of this bird: P8-P10 are old, P7 is almost grown, but P1 is only half-grown; compare this to a flying adult from Nome :