bald eagle

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

• noun A North American eagle (Haliaeetus leucocephalus) characterized by a brownish-black body and a white head and tail in the adult.

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

• (Zoöl.) The white-headed eagle (Haliæetus leucocephalus) of America. The young, until several years old, lack the white feathers on the head.

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

• noun A species of eagle native to North America and notable for the white plumage on its head.

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

• noun a large eagle of North America that has a white head and dark wings and body