Great Black-backed Gull (Larus marinus)
(last update: October 12, 2011)
Great Black-backed Gull 3cy April
Under construction
Great
Black-backed Gull J5RP (Larus marinus) 3cy: April 02 2008, Boulogne-sur-Mer, France (50.42 N - 01.34
E). Picture: J-M Sauvage. 
Great
Black-backed Gull JK37 (Larus marinus) 3cy: April 28 2008, Boulogne/Mer, France. Picture: J-M Sauvage. 
Great Black-backed Gull (Larus marinus) 3cy: April 19 2002, Le
Portel - Boulogne sur Mer, France (50.42 N - 01.34
E). A bird with an ordinary p10 pattern. Note the very obvious inner
primaries and the obvious dark second generation tail-band.
Great Black-backed Gull (Larus marinus) 3cy: April 19 2002, Le
Portel - Boulogne sur Mer, France (50.42 N - 01.34
E). It would be nice to find out whether this presence of a mirror on p10
is related to breeding latitude or not. Some northern birds may look very
delayed in upper-part moult, but can relatively often be found with a
mirror on p10.
Great Black-backed Gull (Larus marinus) 3cy: April 2001, IJmuiden,
the Netherlands (52.27
N, 4.33 E).Recent replaced feathers are more adult-like in the blackish base and undefined pattern. Note the tail pattern.