The Collaborative International Dictionary
sharptail
Pintail \Pin"tail`\, n.
(Zo["o]l.) 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.
(Zo["o]l.) The sharp-tailed grouse of the great plains and Rocky Mountains ( Pedioc[ae]tes phasianellus); -- called also pintailed grouse, pintailed chicken, springtail, and sharptail.
Wiktionary
sharptail
n. 1 The pintail duck. 2 The pintail grouse, or prairie chicken.