any of a genus (Calcarius, family Emberizidae) of northern passerine birds distinguished by their long hind claws
See longspur in American Heritage Dictionary 4
(lôngˈspûrˌ, lŏngˈ-)
noun
Any of several birds, especially of the genus Calcarius of the northern United States, Canada, and the Arctic, having brownish plumage and long-clawed hind toes.