Common Eider
Somateria mollissima

f13 @ 1/2000s, ISO:1600, Nikon D3S w 500mm and 1.7X tele-extender

"Common Eider," Wikipedia, the free encyclopedia.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.
Cape Cod Canal, Bourne, Massachusetts