Bill black; the base orange-yellow: plumage white: tail of eighteen feathers.
C. Bewickii, Yarrell in Linn. Trans, vol. xvi. p. 445. Selby in Newcastle Nat. Hist. Trans, vol. i. p. 17. Faun. Bor. Amer. partii. p. 465. Bewick's Swan, Selb. Illust. vol. ii. p. 284. pl. 47*. (Trachea,) Linn. Trans, vol. xvi. pls. 24, & 25.
Entire length three feet nine inches: length of the bill (to the forehead) three inches six lines, (to the eye) four inches four lines and a half; of the tarsus three inches nine lines; of the middle toe five inches three lines; from the carpus to the end of the wing twenty inches six lines: breadth, wings extended, six feet one inch. Yarr.
Closely resembling the last species, but one third smaller. The whole plumage pure white, tinged, in immature specimens, on the crown, nape, and belly, with reddish orange: bill black; the cere at the base and sides orange-yellow; but no part of this last colour advancing beyond the nostrils, (as in the C. ferns'): irides orange-yellow: legs black: tail cuneiform, of only eighteen feathers*. The young are gray, and the adult plumage is not perfected till the third or fourth year. (Egg). Brownish white, slightly clouded with a darker tint: long. diam. three inches seven lines; trans, diam. two inches six lines.
Like the last, a winter visitant. First distinguished as a peculiar species by Mr Yarrell, and, about the same time, by Mr Richard Win-gate of Newcastle. Breeds in the Arctic Regions. Said to possess a weaker voice than that of the C.ferus. Habits similar.