Waltho, C. M. (2013) “Herring Gulls Larus argentatus in Common Eider Somateria mollissima feeding flocks a discerning kleptoparasite”, Wildfowl, 59, p. 41–52. Available at: https://tidsskrift.dk/Wildfowl/article/view/153952 (Accessed: 15 April 2026).