Junco

from WordNet (r) 3.0 (2006)

junco
    n 1: small North American finch seen chiefly in winter [syn:
         {junco}, {snowbird}]

from The Collaborative International Dictionary of English v.0.48

Junco \Jun"co\, n. (Zool.)
   Any bird of the genus {Junco}, which includes several species
   of North American finches; -- called also {snowbird}, or
   {blue snowbird}.
   [1913 Webster]