Somateria mollissima
The Eider is a large seaduck that can be seen in Britain, particularly in coastal areas, with sightings more frequent in the north and west, often during the winter months or during migration. It is a notable species due to its distinctive appearance and habits.
Use these features to identify Eider in the field.
The Eider can be identified at a glance by its bulky body, long sloping forehead, and distinctive black and white plumage patterns, including a black crown and white patches on the neck and breast.
The Eider is larger than a Mallard, with a sturdy build that makes it one of the bigger ducks in British waters.
The male Eider has a striking black and white plumage, with a black back, white breast, and black crown, as well as greenish-black feathers on the nape and white patches on the neck and breast, with little seasonal variation.
The female Eider has a more subdued mottled brown plumage, providing camouflage in breeding habitats, and is similar to the male in shape but lacks the distinctive black and white patterns.
The Eider's call is a low, cooing "oo-oo-oo" or a soft "ah-ah-ah", often heard from females, while males produce a softer, more guttural sound.
Eiders are social birds that often gather in large flocks, feeding on molluscs and other marine animals, and are known for their fast, direct flight style, with rapid wingbeats.
The Eider can be confused with other seaducks, such as the Common Scoter, but can be distinguished by its larger size, more striking black and white plumage patterns, and distinctive head shape.
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