The Eider is a large sea duck known for its soft down feathers, which are highly prized for insulation. These birds are typically found in the northern regions of Europe, North America, and Asia, often nesting on coastal cliffs and islands. Eiders are known for their distinctive appearance, featuring a stout body and a broad head, with males displaying striking black and white plumage. Eiders primarily feed on marine invertebrates, such as mollusks and crustaceans, diving underwater to catch their prey. They are social birds, often seen in groups, and are known for their migratory behavior, traveling to warmer waters during the winter months.