Great Black-backed Gull (Larus marinus)
(last update: October 12, 2011)
Great Black-backed Gull 4cy May
Third-summer similar to third-winter, but brown on upperwing-coverts fades, combined with new blackish feathers, creating piebald pattern. White primary tips reduced or lacking. Bill as second-winter, but often with extensive dark yellow behind nail. (Malling Olsen, K. & Larsson, H. 2004 Gulls of Europe, Asia and North America. London: Christopher Helm).
|Great Black-backed Gull (Larus marinus) 5T9 1cy-4cy, August 27 2011 - May 26 2014, Sandy Point - Plum Island, Ipswich, MA.|
|Great Black-backed Gull (Larus marinus) 1JR 4CY, May 03 2014, Bullock Harbour, Ireland. Picture: Graham Prole.|