Albert de Jong
Larus cachinnans 2CY P311 April & August 2014, Walberswick, Suffolk & Oostende, Belgium. Picture: Brian Small & Roland Francois.
Green P311, ringed as pullus on May 24 2013 at Kozielno, Paczkow, S-SW Poland, (50°28' N, 16°58' E).
Larus cachinnans 2CY P311 August 13 2014, Oostende, Belgium. Picture: Roland Francois.
By size, probably male. In active complete moult, P6 new, P10 old juvenile in left wing and P9-P10 old in right wing. Still no adult-like grey scapulars moulted in. Bird rather densely vermiculated on greater coverts. The inner greater coverts were previously replaced in the post juvenile moult (see images by Brian). The very worn tips of the feathers in August suggest that these inner greater coverts were replaced again in the first stage of the complete moult, probably last May-June (now 3rd generation inner greater coverts). It would be interesting to see if another partial autumn moult includes these feathers again, then to 4th generation.....
Larus cachinnans 1CY P311 April 04 2014, Walberswick, Suffolk, UK. Picture: Brian Small.
Bird was at Walberswick, Suffolk, UK - 52.18.55N, 1.40.10E.
Note the inner greater and inner median coverts replaced in the partial autumn moult.