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Collective movement decision-making in primates in crop-raiding contexts.

Shaurabh Anand1, Sindhu Radhakrishna1

  • 1Animal Behavior and Cognition Programme, School of Natural Sciences and Engineering, National Institute of Advanced Studies, Bengaluru 560012, Karnataka, India.

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|February 8, 2022
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Summary

Rhesus macaques exhibit equally shared decision-making during crop-raiding, with all age-sex groups participating in leading group movements. This contrasts with predictions of unshared decision-making in risky foraging situations.

Keywords:
Collective movementConsensus decision-makingCrop-raidingPrimatesRhesus macaque (Macaca mulatta)

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Area of Science:

  • Primate behavior
  • Animal ecology
  • Behavioral ecology

Background:

  • Wildlife crop-raiding involves group movement and complex decision-making.
  • Risks and rewards in crop-raiding exceed those in natural foraging.
  • Consensus decision-making in wildlife crop-raiding remains understudied.

Purpose of the Study:

  • To investigate the decision-making processes in rhesus macaques during crop-raiding.
  • To determine if rhesus macaques display unshared consensus during risky crop-raiding movements.

Main Methods:

  • Observation of two rhesus macaque groups during crop-raiding events.
  • Data collection on movement and foraging behavior.
  • Analysis of collective movement and decision-making patterns.

Main Results:

  • Collective crop-raiding movements were primarily initiated by single individuals.
  • All age-sex categories of rhesus macaques led crop-raiding movements.
  • Contrary to predictions, equally shared decision-making was observed.

Conclusions:

  • Rhesus macaques demonstrate a tendency towards equally shared decision-making in crop-raiding.
  • Group movements during crop-raiding involve participation across all age-sex classes.
  • Findings challenge assumptions about unshared decision-making in high-risk foraging.