The Collaborative International Dictionary of English v.0.48:

chickeree \chickeree\ n.
   the far western U.S. counterpart of the red squirrel.

   Syn: Douglas squirrel, Tamiasciurus douglasi.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

chickeree
    n 1: far western United States counterpart of the red squirrel
         [syn: chickeree, Douglas squirrel, Tamiasciurus
         douglasi]