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Whooper swan : ウィキペディア英語版 | Whooper swan
The whooper swan (pronounced ''hooper''), ''Cygnus cygnus'', is a large Northern Hemisphere swan. It is the Eurasian counterpart of the North American trumpeter swan. Francis Willughby and John Ray's ''Ornithology'' of 1676 referred to the this swan as "the Elk, Hooper, or wild Swan".〔 ==Description== The whooper swan is similar in appearance to the Bewick's swan. It is larger, however, at a length of and a wingspan of . Weight typically is in the range of , with an average of for males and for females. The verified record mass was for a wintering male from Denmark. It is considered to be amongst the heaviest flying birds.〔〔 Among standard measurements, the wing chord is , the tarsus is and the bill is .〔 It has a more angular head shape and a more variable bill pattern that always shows more yellow than black (Bewick's swans have more black than yellow).
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