Eider

Somateria mollissima (Common Eider)

The UK's heaviest duck, and its fastest flying. It is a true seaduck, rarely found away from coasts, where its dependence on coastal molluscs for food, has brought it into conflict with mussel farmers. Eiders are highly gregarious and usually stay close inshore, riding the swell in a sandy bay or strung out in long lines out beyond the breaking waves. It is an Amber List species because of its winter concentrations.

Breeding

They breed along rocky coasts with suitable island and reefs with protective rocks and vegetation. Many eiders nest in gull and tern colonies, where they derive some protection as their more aggressive neighbours combine to chase away predators.

Wintering

Sheltered rocky coasts and estuaries.

What does it eat?

Shellfish, especially mussels.

What does it sound like?

A cooing call.

When to see it

All year round in breeding areas. On coasts to the south of the breeding range, birds can be seen from autumn and stay there for the winter.