wood duck

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

• noun A brightly colored North American duck (Aix sponsa) that nests in hollow trees, the male of which is noted for its large crest.

from The Century Dictionary.

• noun The maned goose, Bernicla jubata, found in southern Australia.
• noun The summer duck, Aix sponsa: more fully called crested wood-duck, and also bridal duck, acorn-duck, tree-duck, wood-widgeon, and widgeon.
• noun The hooded merganser, Lophodytes cucullatus. Also tree-duck. See cut under merganser.

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

• noun A colorful North American duck, Aix sponsa, that nests in hollow trees

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

• noun showy North American duck that nests in hollow trees