Mediterranean Gull (L. melanocephalus)
Mediterranean Gull adult E927193 August 28 2014, Boulogne-sur-Mer, NW France. Picture: Jean-Michel Sauvage.
BLB E927193 ringed as adult on May 14 2011 at Total, Antwerpen, BELGIUM (51,15N 4,19E).
From June to September, a complete moult takes place, into so-called "adult winter" plumage. The head pattern resembles the pattern in first winter birds, with blackish mask behind the eye. The mantle, scapulars, tertials and all the wing-coverts are replaced for plain pearl-grey feathers. The secondaries are completely white. The adult primaries are shiny pearly-grey, flashing white at a distance. There is a black line along the outer-web of P10 (and sometimes on P9 as well). Secondaries, under-wing and tail all completely white. The bare part coloration in adult plumage: Iris brown, orbital ring red or orangey-red, the bill red or orangey-red with a black bill-band and a yellowish tip and the legs dull reddish or dark. There is some variation in 3cy and 4cy wing-tip patterns.
This bird is in the last stage of the complete moult, with outer primaries still growing and P10 still old.