For the river see Eider River. For other uses see Eider (disambiguation).

Eiders
Common Eider (Somateria mollissima) in eclipse plumage
Scientific classification
Kingdom: Animalia Phylum: Chordata Class: Aves Order: Anseriformes Family: Anatidae Genus: Somateria Leach, 1819
Species
S. mollissima S. fischeri S. spectabilis

Eiders are large seaducks in the genus Somateria. Steller's Eider, despite its name, is in a different genus.

The three extant species all breed in the cooler latitudes of the Northern hemisphere.

Species

• Common Eider Somateria mollissima
• Spectacled Eider Somateria fischeri
• King Eider Somateria spectabilis

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, USA. The former may not actually belong into this genus.