Is grooming used as a commodity in wild white-handed gibbons, Hylobates lar?

@article{Barelli2011IsGU,
  title={Is grooming used as a commodity in wild white-handed gibbons, Hylobates lar?},
  author={Claudia Barelli and Ulrich H Reichard and Roger Mundry},
  journal={Animal Behaviour},
  year={2011},
  volume={82},
  pages={801-809}
}
Biological market theory is an extension of the idea of reciprocal altruism, as a mechanism to explain altruistic acts between unrelated individuals in a more flexible system of exchanging commodities. In nonhuman primates, social grooming has been used to test predictions in both contexts: reciprocal altruism or biological markets. Specifically, in species in which males cannot coerce females to mate, males may attempt to interchange grooming for mating, particularly when females are fertile… Expand

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