Great Black-backed Gull (Larus marinus)
(last update: July 12, 2015)
Great Black-backed Gull NOS 367624 (Larus marinus) adult: September - October 2004, IJmuiden, the Netherlands (52.27N - 04.33E).
Primary P6 is fully grown while P8-P10 still has to be shed. This bird was seen again on September 24 2004: P7 fully grown and only P10 left.
below: NOS 367624 September 18 2004, IJmuiden, the Netherlands
Great Black-backed Gull (L. marinus) NOS 367624 October 02 2004, IJmuiden, the Netherlands. Picture: Ruud Altenburg.