Bucephala albeola

f9 @ 1/2000s, ISO:800, Nikon D3S w 500mm and 1.7X tele-extender

"Bufflehead," Wikipedia, the free encyclopedia. The Bufflehead (Bucephala albeola) is a small American sea duck of the genus Bucephala. The Bufflehead ranges from 3240 cm long (12.516 inches) and 270550 g (0.61.2 lbs), with the drakes larger than the females. Averaging 35.5 cm (14 in) and 370 g (13 oz), it rivals the Green-winged Teal as the smallest American duck.Adult males are striking black and white, with iridescent green and purple heads with a large white patch behind the eye. Females are grey-toned with a smaller white patch behind the eye and a light underside.The name Bufflehead is a combination of buffalo and head, referring to the oddly bulbous head shape of the species.This is most noticeable when the male puffs out the feathers on the head, thus greatly increasing the apparent size of the head.
Bosque del Apache NWR, New Mexico