The Ruddy Duck Oxyura jamaicensis is one of five introduced birds (three waterfowl and two pheasants) that were admitted to the British and Irish list in 1971, when it was accepted that they had succeeded in establishing self-maintaining feral populations in these islands (British Ornithologists' Union 1971). Some notes on the status of the present species were given by Parslow (1973), in the cours


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