The tundra swan is a small Holarctic swan. The two taxa within it are usually regarded as conspecific, but are also sometimes split into two species, "Cygnus bewickii" of the Palaearctic and the whistling swan, "C. columbianus" proper, of the Nearctic.
Similar species: Ducks, Geese, Etc.
By Pducros
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Uploaded Jun 7, 2015. Captured Jun 7, 2015 16:07 in 40 Castelnau, London SW13 9RU, UK.