Vol. 6, No. 4 
Page 4 
(14 percent), soybean stubble, 3 ('0 percent), winter wheat and soybean stubble, 3 
(10 percent), corn stubble, 2 (7 percent), and various combinations of the above 
types of cover, 4 (14 asrcent). 
Similar censuses will be conducted during subsequent years and on the same 
areas so that annual population changes might be detected. 
Table 4. Census of prairie chickens on booming grounds on 10 sample areas in 
south-central Illinois during the second week of April, 13« 
Census 
Area 
County 
Number of 
Booming 
Grounds 
Total Humber 
of Prairie 
Chickens 
Prairie Chickens 
Per Booming 
G round 
1 
Bond 
2 
13 
8-10 
2 
Clark 
5 
29 
1-17 
3 
C1 ay 
2 
29 
10-15 
4 
Effingham 
1 
14 
— 
5 
Jasper 
5 
89 
4-36 
6 
Jasper 
1 
10 
— 
7 
Ma rion 
6 
53 
3-24 
8 
Pe r ry 
1 
5 
— 
9 
Wayne 
2 
23 
9-14 
10 
Wayne 
4 
45 
7-20 
Tota 1 s 
29 
311 
1-36 
