Approximate distribution of European Herring Gull (Larus argentatus). Green: year-round, yellow: breeding, blue: wintering.  Adapted from: Handbook of the birds of the world, vol. 3: Hoatzin to auks. 1996. Josep del Hoyo, Andrew Elliott, Jordi Sargatal, eds. Lynx Edicions, Barcelona, 821p. (ISBN 8487334202).
Own work
Cephas