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Iceland Gull

Larus glaucoides

ML56005261


©
Sean Williams
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eBird Checklist S36252222
Race Point Beach, Provincetown
Barnstable, Massachusetts, United States
Search this location, Illustrated Checklist
Latitude and Longitude 42.0786, -70.2249 Map

Age
Not specified
Sex
Not specified
Behaviors
Breeding

Comments

Observation details

Continuing. The bird was like an Iceland Gull by structure. Dorsally, p10-6 had extensive dark coloration on both sides of the rachis mid-shaft, and complete dark terminal bands. The outer vane of p9 was continuously dark. The right p5 had a small smudge on the outer vane, toward the tip. The left p5 was completely pale. The legs were pinkish, the eyes were dusky though showing some dark yellow coloration, and the orbital ring was purple-pink. The mantle, in direct sunlight, was a similar color as that of nearby Herring Gulls. My own personal reservations for calling this bird thayeri are two-fold. 1) The dark coloration on the much of the primaries, particularly on p10 and p9 was noticeably paler than the deep black of the primaries on nearby Herring Gulls. Thayer's should be closer to a deep black like a Herring. I think the bird found in this checklist is comparable to the bird in this link- http://www.anythinglarus.com/2015/01/a-mostly-thayers-gull-whiting.html. 2) While the right p5 had a dark smudge, the smudge was quite small, and only present on one of the wings. Thayer's Gulls typically have more dark coloration present on both p5's. I readily concede that the bird could be a fine Thayer's. However, given their rarity on the east coast, I personally am looking for birds that are a slam dunk across the board. Such birds occur regularly around the Great Lakes, so I'll wait patiently for one of those. Finally, I must add that Thayer's Gull may not represent a reproductively isolated taxon. Dunn and Remsen make compelling arguments to discredit Smith (1966; the seminal Thayer's Gull paper that the current treatment hinges upon) in proposal #7 of proposal group 2017-C- http://checklist.aou.org/assets/proposals/PDF/2017-C.pdf.

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