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Definition of Whistling swan
1. Noun. North American subspecies of tundra swan having a soft whistling note. 
Definition of Whistling swan
1. Noun. Alternative name for the Bewick's swan ¹
¹ Source: wiktionary.com
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1. Noun. North American subspecies of tundra swan having a soft whistling note. 
1. Noun. Alternative name for the Bewick's swan ¹
¹ Source: wiktionary.com