Study locations of great cormorant (Phalacrocorax carbo) diet in Norway (triangles) in relation to existing colonies (circles). The sizes of the circles indicate number of nests in the colonies around 2015. Røst, Sklinna, and Frøya (white triangles) hold populations of the subspecies carbo, Rauna, and Øra (black triangles) populations of the subspecies sinensis.