Vol* 5, No. 2 
Page 4 
Bureau and Rock Island. Mallards and pintails occurred in numbers as far north as 
Burlington, Iowa, in the Mississippi River valley. These species were found in 
smaller numbers in the Illinois River valley as far north as Chillicothe. 
7. Wildlife - Insecticide Relationships R. W. Lutz 
Bird counts were conducted in the towns of Donovan and Beaverville during the 
summers of 1960 and 1961. The observer walked a predetermined route along the 
streets of each town and recorded the number of birds of each species that passed 
in front of him. In the summer of 1960, only 6.4 robins, grackles, and starlings 
were observed per hour in Donovan after the town had been treated with insecticide. 
In comparison, 112.8 birds of these species were observed per hour in the untreated 
town of Beaverville. Bird populations in Donovan appeared to be well on the way 
to recovery during 1961. The number of robins, grackles, and starlings observed 
per hour increased from 6.4 in 1960 to 128.4 in 1961, an increase of 1,906 per cent. 
In Beaverville, the number of birds of these species observed per hour increased 
cnly 79 per cent from 1960 to 1961; 112.8 per hour in 1960 as compared with 201.9 
per hour in 1961. Results of the bird count are shown in Table 2. 
Table 2.—Number of birds observed per hour in Donovan and Beaverville during 
1960 and 1961. 
Donovan 
Beaverville 
Year of 
Treatment 
Year After 
Treatment 
Untreated 
1960 
1961 
1960 1961 
Hours of Observation 
15 
13 
14.5 
13 
Number of Birds Per Hour 
Robins 
4.7 
43.5 
33.9 
44.0 
Common Grackles 
0.6 
43.0 
45.0 
93.2 
Starlings 
1.1 
41.9 
33.9 
64.7 
House Sparrows 
80.9 
120.3 
88.9 
107.6 
Mourning Doves 
14.4 
25.9 
18.1 
23.3 
Miscellaneous Birds 
23.9 
32.9 
20.1 
44.9 
Total for All Species 
125.6 
307.5 
239.9 
377.7 
