Yellow-legged Gull - Larus michahellis

(last update: October 08 2013)

Delfín González
Gabriel Martín
Antonio Gutierrez
Amir Ben Dov
Mars Muusse

Yellow-legged Gull michahellis 2CY, April 19 2002, Etaples, NW France (50.42N,1.34E).

A bird showing very advanced moult in the wing-coverts. 
This individual has all the tertials moulted to second generation feathers. These fresh tertials have a neat white fringe, a thin, well demarcated transversal bar and checkered centra. Almost all visible wing-coverts have been replaced, although a few outer coverts, hidden by the flank feathers, are still juvenile. Greater coverts #1-8 have been replaced and the feathers further outwards are missing (exposing the secondaries underneath), median coverts #1-12, except #9, lower lesser coverts #1-10 and about 20 lesser coverts were moulted. The scapulars have been replaced as well and in the lower upper scapulars about 10 feathers show a brown-buffish base. These are third generation feathers, which are very much second generation-like in their pattern.