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    Conspicuous swellings of the perineal skin can be observed in females of many catharrine primate species particularly during the middle stages of the ovarian cycle. The functional significance of this trait remains poorly understood. Recently, two hypotheses, the "reliable indicator" hypothesis and the "graded signal" hypothesis that take into account not only the pattern but also the exaggerated size of sexual swellings, have gained attention. Here we test several predictions made by these hypotheses by combining i direct size measures from video captures of female sexual swellings with ii urinary hormone data to indicate timing of ovulation through enzyme immunoassay measurements of estrone conjugates and pregnanediol glucuronide PdG and iii behavioral observations of male mating efforts throughout 36 ovulatory cycles in 12 wild chimpanzees. We are able to show that i even within the traditionally defined maximum swelling period, further slight increases in swelling size indicate approaching ovulation, and ii that male mating interest changes according to the changes in swelling size.
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    Evolution: Library: Chimps And Bonobos

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    This segment from Evolution: "Why Sex? Although they are close relatives, chimps and bonobos have strikingly different social dynamics: chimps society is prone to violence, and bonobos are relatively peaceful. One theory suggests that a small change in the availability of food may have encouraged the evolution of today's chimp and bonobo societies. Researchers Richard Wrangham and Amy Parish comment on the group dynamics of the two species.
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