snow bunting

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

• noun A small bird (Plectrophenax nivalis) of northern regions, having predominantly white winter plumage.

from The Century Dictionary.

• noun A kind of snowbird, Plectrophanes nivalis, a bunting of the family Fringillidæ, which inhabits arctic and cold temperate regions of both hemispheres, and is chiefly white, varied with black or brown. Also called snowbird, snowflake, snowfleck, snowfligh, snowfowl.

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

• noun A finch, Plectrophenax nivalis, having white plumage; it is widely distributed in northern latitudes.

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

• noun white Arctic bunting