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 1CY, October 18 2002, Westkapelle, the Netherlands. 

In the partial moult, almost no wing coverts have been replaced. All tertails, greater, median and lower lesser coverts are still juvenile. Only one lesser covert has been replaced for a second generation feather. All of the upper scapulars have been replaced, while in the lower scapulars, three rear scapulars are still juvenile and one is missing. The other lower scapulars have been replaced.

For michahellis, this is a very limited partial moult stage, but nevertheless, the inner tail-feathers have been shed. R4-R6 are still juvenile, R1 has been replaced on the left and the other three inner tail-feathers are missing. Michahellis, being advanced in partial moult compared to argentatus, may include tail-feathers in the partial moult in about 5% of the birds, as the table (140 kB) in the 1CY michahellis October Section shows.