pin·tail /ˈpɪnˌtel/
 針尾鴨
 Pin·tail n.
 1. Zool. 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.
 2. Zool. The sharp-tailed grouse of the great plains and Rocky Mountains (Pediocætes phasianellus); -- called also pintailed grouse, pintailed chicken, springtail, and sharptail.
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 pintail
      n : long-necked river duck of the Old and New Worlds having
          elongated central tail feathers [syn: pin-tailed duck,
          Anas acuta]