A P Moller

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The frequency of copulations with multiple mates in a sample of 79 bird species was used to test the hypothesis that cuckoldry is a cost of social living to some males. A disproportionately large percentage of females of colonially breeding species is engaged in copulations with multiple males, and the percentage of extrapair copulations also appears to be(More)
Under the assumption that the absence of visual signs of ovulation (usually termed "concealed ovulation") is an adaptation in primates, there are two main hypotheses concerning the evolution of this trait: it is a means to promote paternal care and increase paternity confidence, and it is a means to confuse paternity issues and thereby improve male behavior(More)
  • Javier Jos, Cuervo, Florentino De, Lope Anders, Pape Moiler, Juan Moreno +3 others
  • 2004
Different hypotheses stress the importance of natural or sexual selection to explain the evolution and maintenance of long outermost tail feathers in the barn swallow (Hirundo rustica). Since energy costs are predicted to arise from tail length manipulation, we measured the daily energy expenditure in three experimental groups (tail-shortened,(More)
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