The Common Eider, Somateria mollissima, is a large (50-71cm body length) sea-duck, which is distributed over the northern coasts of Europe, North America and eastern Siberia. It breeds in Arctic and some northern temperate regions, but winters somewhat farther south in temperate zones, when it can form large flocks on coastal waters. The eider’s nest is built close to the sea and is lined with the celebrated eiderdown, plucked from the female’s breast. This soft and warm lining has long been harvested for filling pillows and quilts, but in more recent years has been largely replaced by down from domestic farm-geese and synthetic alternatives.
L. Brent Vaughan Hill's Practical Reference Library Volume II (NewYork, NY: Dixon, Hanson and Company, 1906)