Table 3. Average, Maximum, and Minimum Percentages of Food Residues in Pellets Collected at Wintering Crow Roosts in the Western Part of the Study Area—1952-53-54.Literature CitedTable 4. Frequencies of Occurrence of Food Residues in Pellets Collected at Wintering Crow Roosts in the Western Part of the Study Area—1952-53-54.
| Dec. 28-Jan. 11 | Aug. 24-Sept. 6 | Sept. 7-20 | Oct. 5-18 | Nov. 16-29 | Dec. 14-27 | Dec. 28-Jan. 10 | Feb. 8-21 |
| Number of pellets | 62 | 5 | 38 | 65 | 56 | 22 | 96 | 32 |
| wheat | 11 | 5 | 10 | 27 | 3 | | 5 | 4 |
| sorghum | 45 | 1 | 22 | 36 | 44 | 16 | 74 | 18 |
| sunflower seed | 43 | | 5 | 12 | 32 | 9 | 68 | 19 |
| corn | 14 | 4 | 11 | 5 | 12 | 8 | 27 | 3 |
| brome grass | 1 | | | | | | 1 | |
| other grass | 15 | | | 5 | 5 | 7 | 15 | 5 |
| grape | | | 1 | | | | 1 | |
| pokeberry | | | 1 | 2 | | | | |
| spurge | | | | 1 | | | 5 | |
| ragweed | | | | | 1 | | 8 | 1 |
| misc. plant | 4 | | 1 | | | | 2 | 2 |
| grasshopper | 1 | 1 | 23 | 38 | 10 | | 5 | 2 |
| beetle | 1 | 4 | 38 | 48 | 15 | 3 | 6 | 4 |
| ant | | | 7 | 6 | | | | |
| crayfish | | | 3 | 1 | | | 1 | |
| snail | 1 | | | | 1 | | 1 | |
| fish | | | 1 | | | | 1 | |
| snake | | | 2 | | | 1 | | |
| eggshell | | | | | 2 | 1 | 9 | 3 |
| mammal | 2 | 3 | 5 | 7 | 10 | 2 | 5 | 1 |