Male King Eider displaying to Eiders. The note on a male Red-breasted Merganser Mergus senator displaying to a party of Goosanders M. merganser (Brit. Birds 79: 89) prompts the following. In the evening of 23rd May 1986, while watching 200-300 Eiders Somateria mollissima feeding and displaying at the mouth of the River Ythan, Aberdeenshire, I noticed that one group of eight males include

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