1. North American subspecies of tundra swan having a soft whistling note
   - Cygnus columbianus columbianus

Derived forms: whistling swans

Type of: Cygnus columbianus, tundra swan

Encyclopedia: Whistling swan

• Bidens bipinnata
• Bidens connata
• Bidens coronata
• Bidens trichosperma
• Bidens tripartita
• bidentate
• bidet
• bidirectional
• Biedermeier
• biennial
• biennially
• bier
• Bierce
• biface
• bifacial
• biff
• bifid
• bifilar
• biflagellate
• bifocal
• bleeder
• bleeder's disease
• bleedin'
• choux pastry
• chow