SNOWBIRD
junco, snowbird
(noun) small North American finch seen chiefly in winter
fieldfare, snowbird, Turdus pilaris
(noun) medium-sized Eurasian thrush seen chiefly in winter
Source: WordNet® 3.1
Etymology
Noun
snowbird (plural snowbirds)
A bird, Junco hyemalis, the dark-eyed junco.
A bird seen primarily in the winter time.
The snow bunting (Plectrophenax nivalis).
A person, usually one who is retired, who travels from a cold climate to a warmer one in the winter.
(slang) A cocaine user.
Source: Wiktionary
Snow"bird, n. (Zoöl.)
(a) An arctic finch (Plectrophenax, or Plectrophanes, nivalis)
common, in winter, both in Europe and the United States, and often
appearing in large flocks during snowstorms. It is partially white,
but variously marked with chestnut and brown. Called also snow
bunting, snowflake, snowfleck, and snowflight.
(b) Any finch of the genus Junco which appears in flocks in winter
time, especially J. hyemalis in the Eastern United States; -- called
also blue snowbird. See Junco.
(c) The fieldfare. [Prov. Eng.]
Source: Webster’s Unabridged Dictionary 1913 Edition