The Collaborative International Dictionary of English v.0.48:

mantled ground squirrel \mantled ground squirrel\ n.
   A common black-striped reddish-brown ground squirrel
   (Citellus lateralis) of western North America, resembling a
   large chipmunk.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

mantled ground squirrel
    n 1: common black-striped reddish-brown ground squirrel of
         western North America; resembles a large chipmunk [syn:
         mantled ground squirrel, Citellus lateralis]