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The redhead -LRB- Aythya americana -RRB- is a medium-sized diving duck .. Aythya. Aythya. diving duck. diving duck. The scientific name is derived from Greek aithuia an unidentified seabird mentioned by authors including Hesychius and Aristotle , and Latin americana , of America .. Greek. Greek language. seabird. seabird. Hesychius. Hesychius of Miletus. Aristotle. Aristotle. Latin. Latin. The redhead is 37 cm long with an 84 cm wingspan .. It belongs to the genus Aythya , together with 11 other described species .. Aythya. Aythya. The redhead and the common pochard form a sister group which together is sister to the canvasback .. common pochard. common pochard. sister group. sister group. canvasback. canvasback. The redhead goes by many names , including the red-headed duck and the red-headed pochard .. This waterfowl is easily distinguished from other ducks by the male 's copper coloured head and bright blue bill during the breeding season .. waterfowl. waterfowl. breeding season. breeding season