570 
ECONOMIC RELATIONS OF OUR BIRDS, 
Family PICID^: Woodpeckers. 
Fig. 133. 
Yellow-bellied "Woodpecicer (Sphyropicus varius). After B., B. and B. 
Tabular Summary of Economic Relations showing the number of sjDCcirnehs 
eating animal and vegetable food, and the number of insects, spiders and 
snails taken from the stomachs, classified as to Economic Relations under 
the heads Beneficial, Detrimental and Unknown Relations. 
Number and Name of Speci¬ 
mens Examined. 
Classification 
OF Food. 
Ratios Represented by Lines. 
1 
1 
Animal food. 
1 
1 
ontained 
Vegetal food.’ 
■ 
1 
One Pileated Wood¬ 
Beneficial. 
pecker examined... 
9 
Detrimental. 
1 
u 
18 
Unknown. 
1 
21 
Animal food. 
Of twenty-one Hairy 
Woodpeckers exam¬ 
ined . 
3 
o 
p 
Vegetal food. 
1 
B 
a 
o 
Beneficial . 
16 
12 
82 
121 
o 
DGfci''inientail ...... 
TTtI Im 
ISHU-—— 
t 
16 
\ 
Animal food. 
Of seventeen Downy 
Woodpeckers exam¬ 
ined . 
6 
13 
a) 
.g 
a 
Vegetal food . 
■ 
1 
1 
Beneficial. 
7 
O 
o 
133 
Detrimental . 
-I'MV.' .. ■ 
13 
48 
Unknown. 
0 . 
1 
