IOWA ACADEMY OF SCIENCE 
PEATE IX 
Fig. 1. A photograph which shows the rolling character of the area. 
Fig. 2. A cornfield is dense, and while it may not be called impenetrable, the re- 
sults of the present study show that it is not frequented by birds. 
Fig. 3. A view of the willow thicket along the .creek. It affords shelter, conceal- 
ment and nesting sites, with water near by. 
