Vol. 5, No. 5 
Page 5 
Four miles of hedge on each of the Donovan and Beaverville areas were studied 
from May 3 to September 10, 1960 and from April 1 to August 30, 1961* In addition, 
4 miles of hedge on the Iroquois area were studied from April 1 to August 30, 1961. 
All nests were inspected every 3 to 10 days. On each visit all nests that were 
active, or had been active, were checked and their status recorded. The number of 
nests located and the nesting success for each species during 1960 and 1961 is 
presented in table 5. The data indicates that those birds which survived the 
treatment nested and produced young without apparent ill effects. 
Brown thrashers were virtually annihilated on the treated areas. No successful 
nests were located on the Donovan area in 1960. In 1961, a year after treatment, 
14 nests were found, 64.2 per cent of which were successful. Two thrasher nests 
were located on the Iroquois area after it was treated in 1961. None of these 
nests were successful however, and adults and young were not observed on this area 
during the summer of treatment. In contrast, in 1960 and 1961, 55.6 and 43.8 per 
cent, respectively, of the brown thrasher nests on the untreated Beaverville area 
were successful. 
Grackle reproduction appeared to be retarded on the Iroquois area after the 
area was treated in 1961, as only 5.8 per cent of the 17 nests under observation 
were successful. In comparison, 73.1 per cent of the 26 nests under observation 
on the untreated Beaverville area were successful. Grackles were common residents 
of the untreated area but were rarely observed on the Iroquois area in the months 
following treatment. The nest study will be repeated in 1962. 
Table 5.—Number of nests and nesting success on the Donovan and Beaverville 
areas during 1960 and 1961, and on the Iroquois area in 1961. 
Donovan 
Area 
Beaverville Area 
Iroquois 
; Area 
Species 
Number 
of 
Nests 
Per Cent 
Nesting 
Success*”* 
Number 
of 
Nests 
Per Cent 
Nesting 
Success*”* 
Number 
of 
Nests 
Per Cent 
Nesting 
Success* 
1960 
1961 
1960 
1961 
1960 
1961 
1960 
1961 
1961 
1961 
Mourning Dove 
26 
30 
76.9 
60.0 
7 
10 
85.3 
60.0 
18 
44.4 
Yellow-billed 
Cuckoo 
9 
6 
88.8 
50.0 
2 
0 
100,0 
.. 
3 
66.7 
Blue Jay 
0 
0 
— 
— 
1 
1 
100,0 
100.0 
0 
-- 
Crow 
0 
2 
-- 
50,0 
0 
4 
— 
50 e 0 
0 
— 
Catbird 
0 
1 
— 
100 o 0 
1 
1 
0,0 
0 e 0 
1 
0.0 
Brown Thrasher 
1 
14 
0.0 
64«2 
9 
16 
55.6 
43 o 3 
2 
0.0 
Robin 
0 
1 
— 
100 „0 
0 
1 
-- 
0,0 
0 
-- 
Shrike 
1 
2 
0.0 
50.0 
0 
0 
— 
-- 
0 
-- 
Common Grackle 
0 
0 
— 
— 
0 
26 
-- 
73.1 
17 
5.8 
Cardinal 
18 
32 
44 c 4 
37.5 
13 
16 
15.4 
12c 5 
21 
23.8 
Indigo Bunting 
1 
0 
0.0 
— 
0 
0 
-- 
— 
0 
-- 
Goldfinch 
0 
2 
— 
50.0 
0 
0 
— 
— 
2 
50.0 
Total 
56 
90 
64,3 
52.2 
33 
75 
48.6 
49.3 
64 
26.5 
* Per cent of nests under observation that fledged young. 
