whistling swan[hwĭsˈlĭng, wĭsˈ-]
whistling swan definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a large, white, North American swan (Cygnus columbianus) usually having a yellow spot in front of the eye: it winters along the Atlantic coast of U.S.
whistling swan definition by American Heritage Dictionary
A white North American swan (Olor columbianus) having a soft, musical trumpeting voice and a black beak with a yellow spot at the base.