黑嘴天鹅 Trumpeter swan
（重定向自Cygnus buccinator）
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黑嘴天鹅，学名Cygnus buccinator，也叫哑音天鹅，属于鸭科天鹅属，是北美本土最大的鸟类。
Cygnus buccinator
中文百科
英语百科
Trumpeter swan 黑嘴天鹅
（重定向自Cygnus buccinator）
The trumpeter swan (Cygnus buccinator) is a species of swan found in North America. The heaviest living bird native to North America, it is also the largest extant species of waterfowl with a wingspan that may exceed 10 ft (3.0 m). It is the American counterpart and a close relative of the whooper swan (Cygnus cygnus) of Eurasia, and even has been considered the same species by some authorities. By 1933, fewer than 70 wild trumpeters were known to exist, and extinction seemed imminent, until aerial surveys discovered a Pacific population of several thousand trumpeters around Alaska's Copper River. Careful reintroductions by wildlife agencies and the Trumpeter Swan Society gradually restored the North American wild population to over 46,000 birds by 2010.
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