Attributes / relations provided by
♦ 1del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.).
Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.
♦ 2Annual Variation in Diet of Breeding Great Cormorants: Does it Reflect Varying Recruitment of Gadoids?, SVEIN-HÅKON LORENTSEN, DAVID GRÉMILLET AND GEIR HÅVARD NYMOEN, Waterbirds 27(2): 161-169, 2004
♦ 3Cirtwill, Alyssa R.; Eklöf, Anna (2018), Data from: Feeding environment and other traits shape
species' roles in marine food webs, Dataset, https://doi.org/10.5061/dryad.1mv20r6