Source : Webster's Revised Unabridged Dictionary (1913)

Junco \Jun"co\, n. (Zo["o]l.)
   Any bird of the genus {Junco}, which includes several species
   of North American finches; -- called also {snowbird}, or
   {blue snowbird}.

Source : WordNet®

junco
     n : small North American finch seen chiefly in winter [syn: {snowbird}]