Great Black-backed Gull (Larus marinus)

(last update: July 12, 2015)
Coordinators:
Jean-Michel Sauvage (France)
Morten Helberg (Norway)
Nils Helge Lorentzen (Norway)
Mars Muusse (Netherlands)

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Great Black-backed Gull (Larus marinus) sub-adult: January 13 2012, IJmuiden, the Netherlands.

Scapulars, many coverts and tertials show adult-like greyish black colour. Primaries with obvious white tips and distinct mirror on P10 and P9. Still many vestiges of immaturity in lesser coverts indicate 4cy.