The Eider Duck (somateria mollissima) with a population of ~300,000 pairs is the commonest and can often be seen in huge congregations off the coast. It continues to be commercially important with the down collected during the summer months, cleaned and used for pillows, duvets etc. The Barrow’s golden eye (bucephala islandica) and the harlequin duck (histrionicus histrionicus) are both North American birds at the extreme eastern limit of their range. They breed nowhere else in Europe.
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