An absolute census was made covering the period from June 18 to 
June 22. Eight calling birds were found within 3/8 of a mile of station 
number 8 (Figures 6 and 7). The five crews heard an average of 3.25 
doves on the morning of June 27 and heard an average of 1.75 doves during 
the evening count. The one-man call count shows an average for the month 
of June of 2.00 doves heard in the morning and 1.50 doves heard in the 
afternoon. The five crews were hearing 1 percent of the calling doves 
in the morning and 22 percent in the evening that were within 3/8 of a 
mile of station number 8 according to the absolute census. During the 
one-man count, 25 percent of the calling doves were heard in the morning 
and 19 percent in the evening. 
No five-crew count was taken in July, but an absolute census was 
made from July 19 to July 23 to compare with the call count that was 
being run. There were six calling doves established within 3/8 of a 
mile of station number 8 at this time. The average number of doves 
heard in the morning in July during the one-man count was 1.50 or 25 
percent of the calling doves present. In the evening 1.25 or 21 percent 
were heard. | | 
In an absolute census covering the days from July 31 to August 6 
‘seven calling doves were found within 3/8 of a mile of station number 8. 
The morning count of the five crews on August 9 averaged 1.70 doves or 
2, percent of the calling doves present. The average number of doves 
heard during the one-man count at station number 8 during the month of 
August in the morning was 2.00 doves or 31 percent of the calling doves 
present. The afternoon count by the five crews did not occur until 
August 20 but these crews averaged .80 doves or slightly over 11 percent. 
No doves were heard during the one-man counts on the afternoons in August. 
Although it has been demonstrated that the péak of calling activity 
in the Mourning Dove is reached at or near sunrise the figures obtained 
at stations do not depend entirely on such a time factor. At first glance 
(Figures 8, 9, and 10) it would seem that the high figures obtained at 
station 8 are due to the fact that the writer, who was running the one- 
man call count, arrived there at sunrise, or shortly thereafter, and that 
the low figures obtained at station 19 are due to the late arrival, usual- 
ly an hour and a half after sunrise. Such is not the case, however, as 
the average for the five crews follows the same pattern of peaks and 
depressions on the graph as does the monthly average of the one-man call 
count. Ina five-crew count as many crews would arrive at station number 
19 at a favorable time as would arrive at station number 8. 
That there are real differences in the calling intensity in relation 
to sunrise and sunset is apparent from Figure 11. Calling intensity is 
more uniform over the evening census period, with a decline to almost no 
activity after sunset. 
11 
