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A diminutive diver, the Bufflehead is one of our smallest ducks, often very energetic in its feeding. Related to the goldeneyes and, like them, nests in cavities; but unlike other hole-nesting ducks, the Bufflehead is small enough to use unmodified old nest holes of Northern Flickers, giving it a ready source of good nest sites. Less sociable than most ducks, seen in pairs or small groups, almost never in large flocks. Takes wing easily from the water, flies with rapid wingbeats. The name 'Bufflehead' is derived from 'buffalo-head,' for the male's odd puffy head shape.