Tundra Swan
Bird
Cygnus columbianus
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The Tundra Swan (Cygnus columbianus) is a small Holarctic swan. The two taxa within it are usually regarded as conspecific, but are also sometimes[1] split into two species, Cygnus bewickii (Bewick's Swan) of the Palaearctic and the Whistling Swan, C. …
The Tundra Swan (Cygnus columbianus) is a small Holarctic swan. The two taxa within it are usually regarded as conspecific, but are also sometimes[1] split into two species, Cygnus bewickii (Bewick's Swan) of the Palaearctic and the Whistling Swan, C. columbianus proper, of the Nearctic.
http://en.wikipedia.org/wiki/Tundra_Swan
http://en.wikipedia.org/wiki/Tundra_Swan
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