Eider with Arctic Tern chick in bill. On 23rd June 1983, on the island of Mousa, Shetland, I was walking through a colony of approximately 230 pairs of ArcticTerns Sterna paradisaea, within which were about 20 nests of Eiders Somateria mollissima. Standing beside one of the latter nests (which contained five warm eggs) was a female Eider with the legs of a tern chick protruding from the side of he
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