Social correlates of testosterone and ornamentation in male mandrills

@article{Setchell2008SocialCO,
  title={Social correlates of testosterone and ornamentation in male mandrills},
  author={Joanna M Setchell and Tessa E. Smith and E. Jean Wickings and Leslie A. Knapp},
  journal={Hormones and Behavior},
  year={2008},
  volume={54},
  pages={365-372}
}
Stress, social behaviour, and secondary sexual traits in a male primate
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Adolescent males that were dominant for their age had higher testosterone levels, larger testes, and more advanced secondary sexual development than subordinate males.
Signal content of red facial coloration in female mandrills (Mandrillus sphinx)
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Colour was brighter during the follicular phase than during the luteal phase, suggesting that it may signal fertility, and varied across gestation and peaked at four and eight weeks post-parturition, suggest that it might signal approaching parturition and lactation.
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TLDR
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TLDR
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Dominance, Status Signals and Coloration in Male Mandrills (Mandrillus sphinx)
TLDR
It is concluded that male mandrills employ both formal behavioral indicators of dominance and of subordination, and may also use relative brightness of red coloration to facilitate the assessment of individual differences in fighting ability, thereby regulating the degree of costly, escalated conflict between well-armed males.
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