ECONOMIC RELATIONS OF OUR BIRDS. 
653 
Tabular Summary of Economic Relations showing the number of specimens con¬ 
taining animal and vegetable food, and the number of insects and spiders 
taken from the stomachs, classified as to economic relations under the heads 
Beneficial, Detrimental and Unknown Relations. 
Number and Name of Speci¬ 
mens EIxamined. 
Classification 
OP Food. 
Ratios Represented by Lines. 
25 
Animal food. 
20 
'd 
o 
Vegetal food. 
MBsaasma^mm 
Of thirty-one Blue Jays 
2 
.9 
B 
5 
Beneficial. 
mm 
7 
d 
o 
a 
10 
Detrimental. 
20 
39 
Unknown. 
Tabular summary of the number and kinds of insects and birds eaten or 
killed by the Blue Jay, 
NnuBSR jlkd Nahs of Spsoi- 
HENS Examined. 
Classification 
OF Food. 
- ^ - 
Ratios Represented bt Lines. 
1 
1 
2 
■s 
2 
15 
% 
u 
30 
Of thirty-one Blue Jays 
fiTaminfvl... 
3 
o 
'd 
4 
1 
.3 
5 
3 
21 
d 
o 
47 
o 
5 
7 
Ant 
I 
Caterpillars. 
Beetles. 
Grasshoppers .... 
Young Robins.... 
Adult forms. 
Yoimg forms. 
122. CoRvus CORAX, Linn. RAVEN. Group HI. Class b. 
This species rarely visits the southern portion of the state, and only in the 
winter. During October and November, 1877, it was very common throughout 
the whole length of the Flambeau river. Several were observed daily, and it 
always occurred singly or in pairs. Notwithstanding the carrion-eating propen¬ 
sity of this species, its insectivorous habits, and the fact that it does not now 
frequent the settled portions of the state, its reputed robbery of birds’ nests must 
class it among the birds whose injuries exceed their services. Its large size, its 
fondness for flesh, and its ability to move where it will, all indicate that but 
few birds which breed in its haunts may not suffer from its attacks. 
Food: Dead flsh, and animal matter of all kinds, birds’ eggs, young ducks, 
chickens, lambs, reptiles, grubs, worms and mollusks (Wilson). Dead animals, 
birds’ eggs, young chickens, lambs and fawns, when they are found unprotected, 
lizards, snakes, and occasionally potatoes and grain (Cooper). Field mice, grubs, 
worms and grains (De Kay). Small animals of every kind, dead flsh, carrion, 
insects, worms, eggs, nuts, berries, and other kinds of fruits (Audubon). 
123. CoRVUS FRUGivoRUS, Bartr. COMMON CROW. Group III. Class b. 
The Crow is common throughout the southern portion of the state, and, to a 
considerable extent, resident during the winter. It is not, however, numerous, 
find I have not seen it north of Stevens Point, in the eastern part of the state. 
