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|King eider in breeding plumage|
The three extant species all breed in the cooler latitudes of the Northern Hemisphere.
- Common eider (Somateria mollissima)
- King eider (Somateria spectabilis)
- Spectacled eider (Somateria fischeri)
Two undescribed species are known from fossils, one from Middle Oligocene rocks in Kazakhstan and another from the Late Miocene or Early Pliocene of Lee Creek Mine, United States. The former may not actually belong in this genus.
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|Wikisource has the text of the 1911 Encyclopædia Britannica article Eider (Duck).|