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Male-Male Mounting Behaviour in Free-Ranging Golden Snub-Nosed Monkeys (Rhinopithecus roxellana).

Gu Fang1, Alan F Dixson2, Xiao-Guang Qi1,3

  • 1College of Life Sciences, Northwest University, Xi'an, China.

Folia Primatologica; International Journal of Primatology
|April 6, 2018
PubMed
Summary

Male golden snub-nosed monkeys engage in diverse mounting behaviors, including sexual acts, influenced by age and social context. This study observed these interactions in an all-male band during their mating season.

Keywords:
All-male bandMale-male mountingRhinopithecus roxellanaSexual behaviourSociosexual communication

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Area of Science:

  • Primate ethology
  • Behavioral ecology
  • Primate social behavior

Background:

  • Male-male mounting is observed in various primate species.
  • The function and context of these behaviors can vary significantly.
  • Golden snub-nosed monkeys (Rhinopithecus roxellana) exhibit complex social structures.

Purpose of the Study:

  • To investigate the frequencies and contextual significance of male-male mounting behavior in golden snub-nosed monkeys.
  • To determine how age influences the performance and context of mounting.
  • To explore potential sexual aspects of male-male mounting in this species.

Main Methods:

  • Observation of an all-male group of golden snub-nosed monkeys for three months.
  • Data collection on the occurrence and context of male-male mounting.
  • Analysis of mounting behavior in relation to the age of participating individuals.

Main Results:

  • Mounting occurred in affiliative, dominance-related, and sexual contexts, varying with age.
  • Adult males initiated most mounts, engaging juveniles and subadults in diverse sociosexual interactions.
  • Rare instances of anal intromission and seminal emission were observed between an adult and subadult male.

Conclusions:

  • Male-male mounting in golden snub-nosed monkeys is multifaceted, serving social and potentially sexual functions.
  • Age significantly modulates the context and expression of mounting behavior.
  • The observed sexual activity may be linked to mating competition and partner availability during the mating season.