Great Black-backed Gull (Larus marinus) adult DA 04651: August 22 2002, Papegaaienbek, Maasvlakte, the Netherlands. (51.57N,04.03 E).

Adult GBBG with a Norwegian metal ring: DA 04651. Obviously, this bird is in wing-covert moult with the outer greater coverts shed, exposing the secondaries underneath. The old scapulars and wing-coverts appear brown hued, in contrast with the new all dark grey coverts and scapulars. The upper tertials are being replaced as well. Primary moult stage: p5 is just longer than p4 and in the outer primaries p8-p10 still have to be shed.