Great Black-backed Gull (Larus marinus)
(last update: October 12, 2011)
Great Black-backed Gull (Larus marinus) 4cy JTU1 September 24 2004, IJmuiden, the Netherlands (52.27 N, 4.33 E).
CR-Code Dark blue ring with white code:
Ringed in Norway and not fully adult. P7 fully grown, no old primaries left. In all respects an adult bird, but note also the black markings on the bill and the brownish old inner wing-coverts.