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This presumed first-basic Thayer's Gull (Larus thayeri) was photographed by Brian Gibbons; at Trinity Oaks Landfill, South Dallas, Texas, on 16 February, 1999. Unusually, the primaries and tertials seem to be the same pale warm brown in tone and shade; there is normally some contrast between the pale tertials and darker primaries. On further study I see some other unusual features: the outer greater secondary coverts are very plain-looking (on open wing); the solidly-dark lateral lower scapulars (visible on the 2nd image) look like retained juvenal feathers; the uppertail appears to be uniformly dark even at the base of the outer retrices - this is normally a strong indicator of Glaucous-winged Gull; any comments?:

Note how the secondaries look concolorous with the rest of the inner wing in the upper photo, but in the picture below they look noticeably darker - a lesson on how angle can change percieved contrast: