A small North American diving duck(Bucephala albeola) having black and white plumage and a densely feathered, rounded head.
巨头鹊鸭一种体型小的北美潜水鸭（巨头鹊鸭），有黑白色的羽毛和稠密的毛， 圆脑袋。
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North American goldeneye diving duck.
北美洲鹊鸭科潜水鸭。
On the Firth of Forth, says Northumbrian Water's Mr Spray, large populations of scaup, a diving duck, vanished after the effluent was cleaned up.
ECONOMIST: For some, sewage is pollution. For others, it's nutrition
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