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Ring-necked duck : ウィキペディア英語版 | Ring-necked duck
The ring-necked duck (''Aythya collaris'') is a diving duck from North America. ==Description==
Ring-necked ducks are small to medium-sized diving ducks. The adult male is similar in color pattern to the Eurasian tufted duck, its relative. Males are a little bit bigger than the female. It has two white rings surrounding its gray bill, a shiny black angular head, black back, white line on the wings, a white breast and yellow eyes. The adult female has a grayish brown angular head and body with a dark brown back, a dark bill with a more subtle light band than the male, grayish-blue feet and brown eyes with white rings surrounding them. Females also make a noise like ''trrr''. The cinnamon neck ring is usually difficult to observe, which is why the bird is sometimes referred to as a "ringbill".〔Bellrose, F. C., Hohman, W. L., Eberhardt, R. T., & Johnsgard, P. A. (n.d.). Duck Species Profile - Ring-necked Duck. Retrieved from http://www.deltawaterfowl.org/research/bios/ringnecked/index.php〕〔National Wildlife Federation, eNature with support from Ducks Unlimited, & The Pew Charitable Trusts. (2007). Boreal Songbird Initiative: Ring-necked Duck. Retrieved from Boreal Songbird Initiative website: http://www.borealbirds.org/birdguide/bd0402_species.shtml〕〔Ring-necked Duck Facts, Figures, Description and Photo. (n.d.). Retrieved from Ducks Unlimited website: http://www.ducks.org/hunting/waterfowl-id/ring-necked-duck〕
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Ring-necked duck」の詳細全文を読む
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