The physical appearance of each of the 25 chipmunks varies slightly and mainly involves the size of the mammal. Chipmunks range in size from an average size of 7 inches and 1. 6 oz for the Least Chipmunk (the smallest of the 25) to the 10 inch 4.6 oz. Eastern chipmunk (the largest of the 25 species).
Chipmunks look a lot like their larger relative the squirrel, however, there is one certain method, other than size, to tell them apart-facial stripping. All varieties of chipmunks have stripes on their faces where squirrels do not. They are lacking that thick furry tail of the squirrel, too.