Long-tailed Duck
Clangula hyemalis

f9 @ 1/3200s, ISO:2500, Nikon D3S w 500mm and 1.7X teleconverter

"Long-tailed Duck," Wikipedia, the free encyclopedia. The female has a brown back and a relatively short pointed tail. In winter, the female's head and neck are white with a dark crown.
Cape Cod Canal, Sandwich, Massachusetts