Black-headed Gull- Kokmeeuw (L. ridibundus)

(last update: 18-10-2005)

Photo 9451: Black-headed Gull L. ridibundus adult, March 16 2003, Le Portel / Boulogne-sur-Mer, France (50.42N,1.34E).

From December onwards (southern breeders) until April, Black-headed Gull has a partial moult including the body and head: the head becomes typically brown with obvious eye-crescents. Some birds develop a pinkish wash on the breast, a phenomenon maybe related to diet. When this moult is completed, birds show the "adult summer" plumage.

From June into October the complete moult in Black-headed Gulls start with the inner primaries. The second generation inner primaries are dark from below with small greyish tips, in this individual from P1 to P6, best visible from above. From P3 outwards (sometimes from P5 outwards) the second generation primaries show much white, except on the outer-web of P10. The under-wing coverts are pale grey, the tail is moulted to all-white feathers and the bill and legs turn dark red. Only a few individuals can be recognised as 2cy (second calendar year) birds in October by the primary coverts, which may still show some dark markings. Otherwise, most 2cy Black-headed Gulls from October are indistinguishable from adults. This individual is in all respects in complete adult plumage.