whistling-swan

whistling swan

noun
the small North American subspecies, Cygnus columbianus columbianus, of the tundra swan.

Origin:
1775–85

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
whistling swan
 
n
Compare mute swan a white North American swan, Cygnus columbianus, with a black bill and straight neck

Collins English Dictionary - Complete & Unabridged 10th Edition
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