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Ruddy duck
The ruddy duck (''Oxyura jamaicensis'') is a duck from North America and the Andes Mountains of South America, one of the stiff-tailed ducks.
==Description==
These are small, compact ducks with stout, scoop-shaped bills, and long, stiff tails they often hold cocked upward. They have slightly peaked heads and fairly short, thick necks. Male Ruddy Ducks have blackish caps that contrast with bright white cheeks. In summer, they have rich chestnut bodies with bright blue bills. In winter, they are dull gray-brown above and paler below with dull gray bills. Females and first-year males are brownish, somewhat like winter males but with a blurry stripe across the pale cheek patch. In flight, Ruddy Ducks show solidly dark tops of the wings.〔http://www.allaboutbirds.org/guide/Ruddy_Duck/id〕
The southern subspecies ''ferruginea'' is occasionally considered a distinct species.〔http://avibase.bsc-eoc.org/species.jsp?avibaseid=1798573A177BC580〕 It is separable by its all-black face and larger size. The subspecies ''andina'' has a varying amount of black coloration on its white face; it may in fact be nothing more than a hybrid population between the North American and the Andean ruddy duck. As the Colombian population is becoming scarce, it is necessary to clarify its taxonomic status, because it would be relevant for conservation purposes.
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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