Common Eider illustration
Birdsong field guide

Common Eider

Somateria mollissima

The Common Eider is a large, heavy-bodied sea duck recognized for its unique wedge-shaped profile and its culturally significant insulating down.

What it sounds like

Males give a low, rhythmic, hauntingly human-like 'ah-hooo', while females produce a hoarse, guttural 'gog-gog-gog'.

Reference call, compare with what you heard
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Rec. Anthony McGeehan · United KingdomCC BY-NC-SAXeno-canto

Field notes

  • It is the largest duck in the Northern Hemisphere, often reaching weights of over 2.5 kilograms.
  • Female eiders line their nests with specialized down feathers plucked from their breasts, which are sustainably harvested for high-end bedding.
  • They are capable of diving to depths of 20 meters or more to forage for blue mussels, which they swallow whole and crush in their muscular gizzards.
  • The species is highly gregarious, often forming large communal 'crèches' where a few adult females guard dozens of ducklings from multiple broods.
  • The male's striking plumage includes a unique pale celery-green patch on the nape of the neck, a rare color in avian feathers.
Habitat
Rocky marine coastlines, shallow coastal waters, and arctic tundra islands.
Range
Northern coasts of North America, Europe, and eastern Siberia.

Similar & commonly confused birds

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