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"A buoyant, large-headed duck that abruptly vanishes and resurfaces as it feeds, the tiny Bufflehead spends winters bobbing in bays, estuaries, reservoirs, and lakes. Males are striking black-and white from a distance. A closer look at the head shows glossy green and purple setting off the striking white patch. Females are a subdued gray-brown with a neat white patch on the cheek. Bufflehead nest in old woodpecker holes, particularly those made by Northern Flickers, in the forests of northern North America."
"Bufflehead are most widespread in migration and winter, when they move south to coasts and large bodies of water, particularly shallow saltwater bays. They breed near lakes in northern forests where conifers mix with poplars or aspens. Bufflehead nest in tree cavities, especially old Northern Flicker holes."