Bufflehead

Bucephala albeola

The tiny and compact bufflehead is the smallest duck.  It has an unusually large puffy head that bears a white marking resembling a "shawl."  It can be spotted diving for small mollusks, crustaceans, and fish.  This "tree nester" establishes a long-term mate and builds a nest in cavities excavated by the Northern Flicker (woodpecker).