common eiders

Did you know?

Common eider numbers are in decline throughout their range in Canada. DUC's Eider Initiative has been created to find out answers as to why this is occurring.

 

Common Eider

Somateria mollissima

The common eider, a sea duck, is the largest duck in the northern hemisphere.

Appearance

  • Distinctive long wedge-shaped bill (males average over 2 kg)
  • Breeding male has white face, neck, breast and back, with black crown, sides, belly and tail; nape is green (males do not attain breeding plumage until 3 years of age); bill is grey-green, yellow or orange
  • Female is brown with black barring, especially along the sides; bill is grey

Breeding

  • Female alone incubates eggs for 26 days after she lays the 2nd or 3rd egg
  • Female does not eat during the incubation period and takes short breaks only to drink – hens can loose up to 45% of their body mass during this period
  • Non-breeding females often join breeding females to help protect the young from predators
  • Pacific race of common eider has been undergoing dramatic declines since the 1980s for unknown reasons

Habitat: Breeds on coastal islands or along ponds and lagoons near the ocean. Winters offshore near marine shoals.

Range: Breeds on marine coasts from Alaska and arctic islands to Hudson Bay and James Bay and along the east coast as far south as Maine. Winters in southern Alaska, Hudson Bay, and the northern Atlantic southward to New Jersey.

Diet: About 75 percent of their diet is mollusks, the rest being a variety of crustaceans. Dive to depths of 20m to feed on mollusks and crustaceans including mussels, clams, scallops and urchins.

Status and Conservation Issues

  • Before hunting regulations were enacted, common eider were greatly reduced in numbers in some areas
  • Over 150,000 pairs of breeding common eider ducks once thrived along Newfoundland and Labrador’s coastline. Today, human activity, industry and a growing predator population have reduced their numbers to a mere 12,000 breeding pairs.
  • DUC’s eider initiative aims to find out why the decline in Newfoundland/Labrador has occurred.

Interesting Facts

  • Largest duck in North America
  • The common eider is the most numerous eider
  • Eider down is one of the lightest and most effective insulators known.
 
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