Interpreting Evidence of Depredation of Duck Nests in the Prairie Pothole Region
Appendix B, Table 4
Table 4. Frequency of eggshells of duck eggs depredated by predators of duck nests in the Prairie Pothole Region during 1972-92 with opening located in an end, side, or both (side-end).
| Location of openings (%) | |||||
| Predator | Data type | No. eggshellsa | End | Side | Side-end |
| Coyote | Artificial Nest | 75 | 0 | 97 | 3 |
| Red fox | Artificial Nest | 42 | 2 | 88 | 10 |
| Raccoon | Artificial Nest | 226 | 59 | 12 | 29 |
| Striped skunk | Artificial Nest | 136b | 14 | 50 | 36 |
| Natural Nest | 48 | 4 | 48 | 48 | |
| American badger | Natural Nest | 79 | 9 | 30 | 61 |
| Mink | Loose egg | 27 | 7 | 63 | 30 |
| Weaselsc | Loose egg | 13 | 38 | 23 | 38 |
| Franklin's ground squirrel | Artificial Nest | 31 | 13 | 23 | 65 |
| Black-billed magpie | Artificial Nest | 12 | 8 | 58 | 33 |
| American crow | Artificial Nest | 42 | 10 | 60 | 31 |
| Gullsd | Artificial Nest | 26 | 0 | 96 | 4 |
| Loose egg | 49 | 0 | 86 | 14 | |
| a | Number of eggshells examined whose connected parts made up ≥50% of the intact shell of an egg. |
| b | Excludes 70 eggs eaten by a captive striped skunk that opening 50% of eggs on an end, 16% on the side, and 34% on a side-end. |
| c | Ermine and long-tailed weasel. |
| d | Ring-billed gull and California gull. |
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