Adult Great Black-backed Gull / Larus marinus, Westkapelle - sea dike (The Netherlands) on 17 September 2010
Ringcode: JP36, there is no ring data of this bird. An adult Great Black-backed Gull which I have seen earlier at Neeltje Jans on 10 October 2007. On the flight picture note the primary moult stage, p1-p6 are fully grown (note also the less amount of black on p6 and the complete absence of black on p5), p7 is still growing, p8 is absent and p9-p10 are still old primaries. Recently the moult wave in the secondaries has started and the outermost one is just replaced and still growing. And the outer and middle greater coverts are recently replaced by new generation dark-blackish coverts.