RFI Chipmunk near Yellowstone National Park

Attached are two images of a chipmunk sp. taken 15 June 2015 at the Rock Creek Scenic Overlook near Red Lodge Montana, on our way to the NE entrance of Yellowstone.  I believe three species of chipmunk are known from the area.  Can anybody help identify this one from the photos?  Thanks in advance.

. ChipmunkP1030223 ChipmunkP1030225


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