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Redhead (bird)
The redhead (''Aythya americana'') is a medium-sized diving duck, long with an wingspan. It belongs to the genus Aythya, together with 11 other described species that are found all over the world. Only 5 ''Aythya'' species are found in North America: redhead, canvasback, lesser scaup, greater scaup and the ring-necked duck. The redhead and the common pochard form a sister group which together is sister to the 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 breeding season.
== Taxonomy and Phylogeny ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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