Unsorted Wild Birds

Common Eider (Somateria mollissima)

The Common Eider (Somateria mollissima) is a sea-duck, which is distributed over the northern coasts of Europe, North America, and eastern Siberia. The species is often readily approachable.

It breeds in the Arctic and some northern temperate regions, but winters somewhat farther south in temperate zones, when it can form large flocks on coastal waters.

Common Eiders

Common Eider Male in flight


It is abundant, with populations of about 1.5-2 million birds in both North America and Europe, and also large but unknown numbers in eastern Siberia (HBW).

A particularly famous colony of eiders lives on the Farne Islands in Northumberland, England. These birds were the subject of one of the first-ever bird protection laws, established by Saint Cuthbert in the year 676. About 1,000 pairs still nest there every year.

Because St. Cuthbert is the patron saint of Northumberland, it was natural that the eider should be chosen as the county’s emblem bird; the birds are still often called Cuddy’s ducks in the area, “Cuddy” being the familiar form of “Cuthbert”

Range of the Common Eider

Common Eider Male Facial Details

The Common Eider is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies.

Nesting / Breeding:

Eiders are colonial breeders. They nest on coastal islands in colonies ranging in size from less than 100 to upwards of 10,000 to 15,000 individuals. Female eiders frequently exhibit a high degree of natal philopatry, where they return to breed on the same island where they were hatched.

This can lead to a high degree of relatedness between individuals nesting on the same island, as well as the development of kin-based female social structures.

This relatedness has likely played a role in the evolution of cooperative breeding behaviours amongst eiders. Examples of these behaviours include: laying eggs in the nests of related individuals and crèching, where female eiders team up and share the work of rearing ducklings.

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.

Although true Eiderdown pillows or quilts are now a rarity, eiderdown harvesting continues and is sustainable, as it can be done after the ducklings leave the nest with no harm to the birds.

Common Eider Adult Females and Chicks


The Common Eider is a large (50-71 cm body length) sea duck that is characterized by its bulky shape and large wedge-shaped bill.

The male is unmistakable with its black and white breeding plumage and green nape. Below are photos of a non-breeding and an immature male.

Male Common Eider

The female is a brown bird, but can still be readily distinguished from all ducks, except other eider species, on the basis of size and head shape.

Call / Vocalizations: This duck’s call is a pleasant “ah-ooo.”

Common Eider Couple

Common Eider Drake

Diet / Feeding:

This species dives for crustaceans and mollusks, with mussels being a favored food. The Eider will eat mussels by swallowing them whole, the shells are then crushed in their stomachs and excreted. When eating a crab the Eider will remove all of its claws and legs and then eat the body in a similar fashion.

Feeding Ducks …

We all enjoy ducks and many of us offer them food to encourage them to come over and stay around – and it works! Who doesn’t like an easy meal?

However, the foods that we traditionally feed them at local ponds are utterly unsuitable for them and are likely to cause health problems down the road. Also, there may be local laws against feeding this species of bird – so it’s best to check on that rather than facing consequences at a later stage.

  • Foods that can be fed to Ducks, Geese, and Swans to survive cold winters and remain healthy when food is scarce in their environment.

Please note that feeding ducks and geese makes them dependent on humans for food, which can result in starvation and possibly death when those feedings stop. If you decide to feed them, please limit the quantity to make sure that they maintain their natural ability to forage for food themselves – providing, of course, that natural food sources are available.

Relevant Resources

Common Eider Drake

Beauty Of Birds strives to maintain accurate and up-to-date information; however, mistakes do happen. If you would like to correct or update any of the information, please contact us. THANK YOU!!!


Gordon Ramel

Gordon is an ecologist with two degrees from Exeter University. He's also a teacher, a poet and the owner of 1,152 books. Oh - and he wrote this website.

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