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.
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.