American birds, Anatidae, Animalia, Anseriformes, April, Aves, Bucephala ableola, Bufflehead, Chordata, North America, US, USA, Wisconsin, Wisconsin lake, avian, bird, birding, birdlife, birdwatching, black, blue, blue water, breeding plumage, bucephala, changing colors, diving bird, diving duck, drake, drake bufflehead, drake duck, drake sea duck, duck, fauna, gamebird, green, iridescence, iridescent, lake, male, male bufflehead, male duck, male sea duck, migrant, migrating, migratory, natural, nature, north american, northern, northern Wisconsin, northwoods, one, ornithology, rainbow colors, sea duck, small duck, small sea duck, spirit duck, spring, spring time, springtime, striking plumage, swim, swimming, water, waterfowl, waterway, white, wild, wildlife