house sparrow

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

• noun A small bird (Passer domesticus) native to the Old World but widely naturalized elsewhere, having brown and gray plumage with a black throat in the adult male.

from The Century Dictionary.

• noun The common sparrow, Passer domesticus, a native of Europe, now introduced in many other countries, as in the United States, Australia, and New Zealand.

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

• noun small hardy brown-and-grey bird native to Europe