HOFFMEISTER & MOHR: ILLINOIS MAMMALS 



17 



1. A steep mound of earth, usually circular and conical, 

 thrust upward from the center and associated with one or more 

 subsurface runs which hump up the ground and are readily 

 visible, fig. 6. is typical of the work of moles. 



Fig. 7. — Mound of plains pocket gopher. 



Fig. 8. — Entrance to burrow of Norway rat. 



