Great Black-backed Gull (Larus marinus)

(last update: July 12, 2015)

Great Black-backed Gull (Larus marinus) JP778 October - November 2012 & February 2015, Den Oever, the Netherlands.

Ringed as pullus on July 07 2012 at Vest-Agder, Norway.

below: Great Black-backed Gull (Larus marinus) JP778 1cy: October 04-05 2012, Den Oever, the Netherlands. Picture: Fred Visscher & Ina van Velthuisen.

US: 0%, LS: 0%, TOT SCAPS: 0%. Some scaps missing. Tertials and coverts juvenile, but GC4 looks fresher?

below: Great Black-backed Gull (Larus marinus) JP778 1cy: November 28 2012, Den Oever, the Netherlands. Picture: Frans Nottrot.

Speeding up the moult:

US: 50-75%, LS: 0%, TOT SCAPS: 25-50%.

below: Great Black-backed Gull (Larus marinus) JP778 4cy, February 21 2015, Den Oever, the Netherlands. Picture: Fred Visscher.

retarded looking bird as 4CY. Much black in tail, many barred coverts, lower tertials barred at fringes, small mirror on P9.