The Collaborative International Dictionary of English v.0.48:

Sharptail \Sharp"tail`\, n. (Zool.)
   (a) The pintail duck.
   (b) The pintail grouse, or prairie chicken.
       [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pintail \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.
      [1913 Webster]

   2. (Zool.) The sharp-tailed grouse of the great plains and
      Rocky Mountains (Pedioc[ae]tes phasianellus); -- called
      also pintailed grouse, pintailed chicken,
      springtail, and sharptail.
      [1913 Webster]