Great Black-backed Gull (Larus marinus) distribution map
Range_map for Larus marinus based on:
Lars Larsson, Birds of the World, 2001, CD-rom
Mullarney, K. Svensson, L. Zetterström, D. (1999) Fågelguiden, Europas och medelhavsområdets fåglar i fält. Stockholm: Albert Bonniers förlag
David Allen Sibley, The Sibley Guide to Birds, 2000, ISBN 0-679-45122-6 No machine-readable author provided. AHA2 assumed (based on copyright claims)., CC BY-SA 3.0 <http://creativecommons.org/licenses/by-sa/3.0/>, via Wikimedia Commons
Red - Breeding ground Purple - All year round Blue - Winter