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Many hybrid ducks have been recorded, but as pointed out by Bigelow (1907, p. 382), few specimens have been fully described….
hybrid ducks, crosses, Bucephala, Lophodytes
Ball, Stanley C.. 1934. "Hybrid ducks, including descriptions of two crosses of Bucephala and Lophodytes." Bulletin of the Peabody Museum of Natural History , (3). https://elischolar.library.yale.edu/peabody_museum_natural_history_bulletin/3