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Fecha
Localidad
- Edad y sexo
- Inmaduro, sexo desconocido - X
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Thayer's 1: the immature 2nd cycle. Size and color of bill in relation to a 2nd cycle Herring Gull. The bill of the Thayer's is diffusely dark and dark along the cutting edge, while this Herring's is Glaucous-like with a pink base and cleaner cut black end with no dark proceeding back to the bill base along the cutting edge of the bill. The dark along the cutting edge thing is a trait of Iceland Gulls, although Herring Gulls can show it also. It is said that some 2nd cycle ICGUs can show a Glaucous-like bill, but I have never seen one. Tertials and primaries lighter in color than those of the Herring Gull, with the primaries contrasting with the tertials and darker in the Thayer's.
Detalles de la observación
FHC, submitted 02.19.19 These are really normal counts here in late January/early February. I expect most of these birds will be gone as soon as/if it warms up in early March. Two adults and one immature- a 2nd cycle. The immature had some gray in the scapulars at the top of the back and primaries with pale fringes that did not run to the outer webs of the primaries. The primary panel as a whole being light brown, not dark like a Herring Gull, but darker than the mantle and also the tertials- the feathers just above the primaries. Small rounded head and with a bill blunter and smaller than the 2nd cycle Herring it was near. The bill also was diffusely dark near the tip with dark running back along the cutting edge of the bill, not the Glaucous-like clean cut black at the end of the bill with a pink-base that the 2nd cycle Herring near it showed, and which others can show. It is said that some 2nd cycle ICGUs can show a Glaucous-like bill, but I have never seen one yet. A small Glaucous with longer wings can be confusing. Immediately prior to this observation a 2nd cycle Kumlien's was seen in flight at the Elkhart Landfill, but I do not believe this is that bird. The primaries on that bird were white enough for it to be confused as a Glaucous Gull, on two separate occasions by multiple persons, and the primaries of that Kumlien's were later seen to be whitish from the same @ distance as the bird in this observation. Thayer's usually have primaries darker than the body, being closer in lineage to the Herring Gull, and Kumlien's show primaries not any darker than the body, especially from a distance, being closer in lineage to the Iceland Gull glaucoides.
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