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Seems like a strong Thayer's candidate! Photo, details, and hopefully video to add. First seen perched among the gull flock, noticed due to the "frosted" primaries on folded wing. Sunset was near, so the light was low, but I still had a great look at this bird through the scope. Structurally, the bird's body resembled a Herring Gull, but the head size was closer to Iceland. It was easily as bulky as the Lesser Black-backed, appearing very close to Herring Gull in terms of bulk. The bill did appear fairly long and robust, a "Thayer's" trait more than "Kumlien's". Plumage-wise, this bird was very dark for an Iceland. Although the back was somewhat frosted, the main body was darker than many of the immature Herring Gulls. I didn't note specific markings, but photos show an overall crisper plumage than the surrounding Herring immatures (which were highly variable). Once the bird stretched its wing out, while I was taking phone video! This video is grainy but shows a pale upperwing with darker outer primaries (still quite brown, though, not as dark as HERG). I had a great scope look as the bird took off for a short flight. Its topside was very evenly pale brown to me, with a pale rump that hardly differed from the mantle and wings in color. Unfortunately I didn't note if it had a dark secondary bar or darker tail than most Iceland Gulls. My best view of the primaries from below happened when it landed. These were a bright silvery color all the way through the wingtips. Overall, the bird's structure and plumage indicated "Thayer's" Iceland more than either Herring or "Kumlien's" Iceland to me. EDIT: Video of the bird's spread wing shows a beautiful "Thayer's" pattern. The outer primaries are edged with dark through to p6, with possibly a mark on p5. I think this amount of dark is out of "Kumlien's" range but still well short of Herring Gull's dark outer primaries. The darker secondary bar is also a great mark for "Thayer's" Iceland.
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