snowbird

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of several birds, such as the junco and the snow bunting, common in snowy regions.
• noun Slang One who moves from a cold to a warm place in the winter.

from The Century Dictionary.

• noun A bird associated in some way with snow. ,
• noun The ivory gull, Larus eburneus, an arctic species that in winter is pure white.

from the GNU version of the Collaborative International Dictionary of English.

• noun Prov. Eng., Prov. Eng. An arctic finch (Plectrophenax nivalis syn. 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.
• noun Prov. Eng., Prov. Eng. Any finch of the genus Junco which appears in flocks in winter time, especially Junco hyemalis in the Eastern United States; -- called also blue snowbird. See junco.
• noun Prov. Eng. The fieldfare.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A bird, Junco hyemalis, the dark-eyed junco.
• noun A bird seen primarily in the winter time.
• noun The snow bunting (Plectrophenax nivalis).
• noun A person, usually one who is retired, who travels from a cold climate to a warmer one in the winter.
• noun slang A cocaine user.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun white Arctic bunting
• noun medium-sized Eurasian thrush seen chiefly in winter
• noun small North American finch seen chiefly in winter