Sexual swellings advertise female quality in wild baboons

@article{Domb2001SexualSA,
  title={Sexual swellings advertise female quality in wild baboons},
  author={Leah G. Domb and Mark Pagel},
  journal={Nature},
  year={2001},
  volume={410},
  pages={204-206}
}
The females of many Old World primate species produce prominent and conspicuous swellings of the perineal skin around the time of ovulation. These sexual swellings have been proposed to increase competition among males for females or to increase the likelihood of a female getting fertilized, by signalling either a female's general reproductive status, or the timing of her ovulation. Here we show that sexual swellings in wild baboons reliably advertise a female's reproductive value over her… 

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Effects of Sexual Selection Upon Sperm Morphology and Sexual Skin Morphology in Primates

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