indigo bunting

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

• noun A small bird (Passerina cyanea) of the Americas, the male of which has deep blue plumage.

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

• noun A blue bunting of North America, Passerina cyanea.

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

• noun small deep blue North American bunting