i6 
Report on the Food Found in 
Summary, 1914. 
In January, February, March, and May a large amount of 
grain was eaten by the 39 birds examined. On the other 
hand, in the 4 birds examined in April, 42 harmful insects 
were found, but no grain. During the other months com- 
paratively little insect food was eaten. No mollusca were 
found at all, except 6 Twist Snails (neutral). Two harmful 
Myriapoda, and 4 beneficial insects were eaten, and 4 earth- 
worms. It seems, therefore, that in 4 out of the 5 months 
the 39 birds were doing very much more harm than good, 
whilst in the fifth month (April) 4 birds were doing more good 
than harm. 
The Rook. 
Chief Insects Eaten. 
1912. 
Month. 
Wire- 
worms. 
Click 
Beetles. 
Leather 
Jackets. 
Chafers. 
Surface 
Larvae. 
No. of 
Birds. 
January. . ^ . . 
7 
0 
O 
0 
0 
4 
February 
27 
0 
0 
3 
32 
32 
March 
16 
I 
0 
7 
20 
18 
April 
76 
2 
15 
29 
4 
54 
May 
0 
0 
0 
9 
0 
8 
June 
24 
0 
0 
0 
0 
8 
July 
7 
0 
0 
2 
0 
2 
August . . 
— 
— 
— 
— 
— 
September 
— . 
— 
— 
— 
— 
October 
2 
0 
0 
7 
0 
11 
November 
28 
0 
O 
0 
0 
4 
December 
1 
0 
0 
0 
0 
5 
Total . . 
188 
3 
15 
57 
56 
146 
