Source : Webster's Revised Unabridged Dictionary (1913)

Longspur \Long"spur`\, n. [So called from the length of the hind
   claw.] (Zo["o]l.)
   Any one of several species of fringilline birds of the genus
   {Calcarius} (or {Plectrophanes}), and allied genera. The
   Lapland longspur ({C. Lapponicus}), the chestnut-colored
   longspur ({C. ornatus}), and other species, inhabit the
   United States.