Tundra Swan
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The Tundra Swan was split into two species:
- Whistling Swan, Cygnus columbianus
- Bewick's Swan, Cygnus bewickii
Reference: Livezey, Bradley C. (1996): "A phylogenetic analysis of geese and swans (Anseriformes: Anserinae), including selected fossil species". Systematic Biology Vol.45, pp.415-450
