Selectieve predatie op Driehoornmestkevers Typhaeus typhoeus door Klapekster Lanius excubitor en Ransuil Asio otus?
Drentse vogels , Volume 9 - Issue 1 p. 45- 47
The sex ratio of Dung Beetles is fifty-fifty. However, male Dung Beetles (71%, n=316) greatly outnumbered females in the diet of wintering Great Grey Shrikes, whereas the reverse was true in Long-eared Owls (16%, n=73). During the reproductive period (winter) female Dung Beetles slay in their burrows for most .of the time, which may explain the preponderance of males in the diet of Great Grey Shrikes. The small proportion of male Dung Beetles in Long-eared Owl pellets remains a mystery.
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