pintail

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

• noun Any of several ducks of the genus Anas having sharply pointed tails, especially A. acuta, found throughout the Northern Hemisphere.

from The Century Dictionary.

• Same as pintailed.
• noun The pin-tailed duck, Dafila acuta. Also called, from the peculiarity of the tail, pickettail, pigeontail, piketail, sharptail, spiketail, spindletail, splittail, sprigtail, sprittail or spreettail, and kite-tailed widgeon. See cut under Dafila.
• noun The ruddy duck, Erismatura rubida.
• noun The sharp-tailed or pin-tailed grouse, Pediœcetes phasianellus, more fully called pintail chicken.

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

• noun (Zoöl.) A northern duck (Dafila acuta), native of both continents. The adult male has a long, tapering tail. Called also gray duck, piketail, piket-tail, spike-tail, split-tail, springtail, sea pheasant, and gray widgeon.
• noun (Zoöl.) The sharp-tailed grouse of the great plains and Rocky Mountains (Pediocætes phasianellus); -- called also pintailed grouse, pintailed chicken, springtail, and sharptail.

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

• noun A dabbling duck, Anas acuta, of the northern hemisphere that has a long pointed tail.

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

• noun long-necked river duck of the Old and New Worlds having elongated central tail feathers