MONTHLY WILDLIFE RESEARCH LETTER 
Vol. 1, No. 9 
Page 2 
An error was made in last month's calculation of reproduction. Re¬ 
production for this year is 6,5 per cent lower than that of last year. The 
marked drop, reported at the time of our heavy mid-summer rains in June and July, 
made this year's level of reproduction 6.5 per cent lower than last year's. 
Statistical analyses of pellet counts made on the Sibley study area 
show that hayfields were frequented more by rabbits than were soybean fields but 
that there was no significant difference between the comparative counts for soy¬ 
beans and corn or between those for corn and hay. This year's counts were sig¬ 
nificantly lo T wer than last year's for both corn and soybeans. Hayfields were not 
checked last year. 
Trapping was begun in the Sanctuary and lj-H study area on the Robert 
Allerton Park. Trapping is going exceptionally well on the Robert Allerton U-H area 
with 62 rabbits having been captured, marked and released in the past ii week's 
trapping. 
Wide-row Corn Project P. Vohs, R. Conder 
Preparation of the data from the 3-year study of wide-roitf corn project 
for publication was continued. Progress to this date indicates that the first 
rough draft will be completed in October. An abstract has been submitted and Mr. 
Jack A. Berryman, Chairman of Field and Farm Resources for the North American 
Wildlife Conference, has been petitioned for a place on the program. 
A paper concerning the wildlife and agricultural values of wide-row 
corn was presented at the Ninth Annual Great Plains Habitat Conference held in 
Crawford, Nebraska, during the latter part of the month. The delegate from 
Illinois, in addition to presenting the initial paper at the conference, partici¬ 
pated in two panel discussions dealing with woody habitat development and evalu¬ 
ation of wildlife plantings. 
W-55-R-3 
F. Bellrose 
This project was inactive during September. 
W-56-R-3 G. Sanderson, K. Johnson 
All woods within the raccoon-wood duck study area at Havana were 
surveyed to determine species-composition of trees, diameter at height of breast, 
number of cavities in each tree species, and total number of cavities in order to 
correlate these factors with wood duck usage of each area. The data are being 
tabulated. 
Live-trapping of raccoons and opossums was continued on the Allerton 
Park study area for the first few days of the month but was interrupted by road 
repairs. Since the previous report nine raccoon and 15 opossum captures have been 
made. Approximately 100 different opossums and 100 different raccoons have been 
