544 
ECONOMIC RELATIONS OF OUR BIRDS. 
Tabular Summary of Economic Relations shoiving the name and number of speci¬ 
mens eating animal and vegetable food, and the number of insects, cray-Jish 
and earth-ioorms contained in the stomachs, classified as to economic rela¬ 
tions under the heads Beneficial, Detrimental and tfnknown Relations. 
Number and Name op Speci¬ 
mens Examined. 
Classification 
OP Food. 
Ratios Represented by Lines. 
Of thirteen Bobolinks 
examined. 
Of six Cowbirds exam¬ 
ined . 
10 
4 
2 
6 
6 
a; 
a 
o 
O 
a? 
$ 
o 
O 
Animal food. 
wmm 
Vegetal food. 
m 
2 
Beneficial. 
B 
11 
Detrimental . 
BBmm 
27 
Unknown. 
iiiifii'iiiiiBiiiinrpiiiMiii 
Animal food. 
m 
Vegetal food. 
m 
Beneficial. 
9 
Detrimental. 
mem 
12 
Unknown. 
Of eighty-four Red¬ 
winged Blackbh’ds 
examined. 
21 
80 
5 
16 
Contained 
[ 
Animal food. 
Vegetal food. 
■■■■ .. 
9 
26 
Beneficial. 
Detrimental. 
Unknown . 
fSM 
21 
1 
Animal food. 
1 
1 
Vegetal food. 
fl 
Of twenty-one Meadow 
n 
i 
10 
Beneficial. 
Liirks examined. 
d 
15 
o 
o 
30 
Detrimental. 
12 
32 
Unknown. 
IIHir^lllBIBBilMIIBM 
Of eight Baltimore Ori¬ 
oles examined. 
8 
1 
6 
4 
Contained 
Animal food. 
Vegetal food. 
1 
50 
9 
Beneficial. 
Detrimental. 
Unknown.. 
Of five Rusty Gracldes 
examined. 
3 
3 
1 
3 
Contained 
Animal food. 
Vegetal food. 
■ 
B 
8 
9 
Beneficial . 
Detrimental . 
Unknown . 
II 
5 
Animal food. 
6 
0$ 
Vegetal food. 
BB 
Of nine Purple 
J 
Beneficial. 
Crackles examined.. 
p! 
- 
1 
o 
o 
2 
lA 
Detrimental . 
a 
' 
O 
