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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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