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A large sea duck, which breeds in Canada and Alaska. It winters further south in temperate zones, on the coasts of the northern USA. Small numbers regularly winter in western Europe as far south as Great Britain and Ireland. Some birds may over-winter on the Great Lakes. It forms large flocks on suitable coastal waters. These are tightly packed, and the birds tend to take off together.
First time I've ever seen such a bird... really "muppet" looking, he just hung out fishing in the water at the bouy pier.