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A small (length 46 cm) duck with a thin serrated bill and a puffy crest; adult male has a black head with a large white patch on each side, a dark back, brown flanks, and a white chest with two black bars on each side; adult female is brownish overall, with a yellowish lower mandible; first winter male resembles female; in flight, both sexes show black-and-white inner secondaries (Peterson 1980,...