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.
Uploaded Nov 18, 2018. Captured Nov 10, 2018 12:04 in Unnamed Road, Burgas, Bulgaria.