The eggs of Eiders Somateria mollissima have been seen in the nests of Herring Gulls Larus argentatus in several locations (Robertson 1930, Barker 1938, Gross 1938), but few details have been recorded. In recent years, gull nests containing both gull and Eider eggs have been found at South Walney Nature Reserve, Cumbria, where in 1978 I made some observations concerning this phenomenon.The Wa


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