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whistling swan

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

Origin of whistling swan

First recorded in 1775–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for whistling swan

whistling swan

noun
  1. a white North American swan, Cygnus columbianus, with a black bill and straight neckCompare mute swan
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012