ILLINOIS NATURAL HISTORY SURVEY MANUAL 4 



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Skunk Red fox Little brown bat 



Cottontail Woodchuck 

 Pocket gopher mound 



Thirteen-lined ground squirrel j^^^^ ^^^^^ 



Least shrew rrairie vole 



Pocket gopher Storage chamber of prairie vole 



Fig. 2. — Characteristic mammals of Illinois fields and fencerows. 



