tundra swan - définition. Qu'est-ce que tundra swan
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Qu'est-ce (qui) est tundra swan - définition

SPECIES OF BIRD
Whistling Swan; Whistling swan; Bewick's swan; Cygnus columbianus; Bewick’s swan; Buick's Swan; Buick Swan; Bewick's Swan; Cygnus bewickii; Cygnus columbianus jancowskii; Cygnus columbianus jankowskii; Swan, Bewick’s; Bewick’s Swan; Tundra Swan; Whistling wwan; Tundra swans
  • Woodcut by [[Robert Elliot Bewick]] of the swan named in memory of his father by [[William Yarrell]]. 1847 edition of [[Thomas Bewick]]'s ''[[A History of British Birds]]''.
  • Bewick's swan (''Cygnus bewickii'') with [[northern lapwing]] and [[common shelduck]], at [[Hickling Broad]], Stalham, Norfolk UK
  • Adult whistling swans (''C. c. columbianus''). Click to magnify for seeing variation in the yellow bill spots.
  • Saitama]] (Japan)
  • The egg
  • Adult whistling swan in flight. Seen from below, all "Arctic" swans look almost identical
  • Whistling swan with yellow patch at base of bill

tundra swan         
¦ noun an Arctic-breeding migratory swan with a yellow and black bill, with two subspecies (Bewick's swan and whistling swan). [Cygnus columbianus.]
whistling swan         
¦ noun a bird of the North American race of the tundra swan. [Cygnus columbianus columbianus.]
Bewick's swan         
¦ noun a bird of the Eurasian race of the tundra swan. [Cygnus columbianus bewickii.]
Origin
from the name of the English artist and engraver Thomas Bewick (1753-1828).

Wikipédia

Tundra swan

The tundra swan (Cygnus columbianus) is a small swan of the Holarctic. The two taxa within it are usually regarded as conspecific, but are also sometimes split into two species: Bewick's swan (Cygnus bewickii) of the Palaearctic and the whistling swan (C. columbianus) proper of the Nearctic. Birds from eastern Russia (roughly east of the Taymyr Peninsula) are sometimes separated as the subspecies C. c. jankowskii, but this is not widely accepted as distinct, with most authors including them in C. c. bewickii. Tundra swans are sometimes separated in the subgenus Olor together with the other Arctic swan species.

Bewick's swan was named in 1830 by William Yarrell after the engraver Thomas Bewick, who specialised in illustrations of birds and animals. Cygnus is the Latin for "swan", and columbianus comes from the Columbia River, the type locality.