Responding to inequities: gorillas try to maintain their competitive advantage during play fights.

Biology Letters
Edwin J C Van LeeuwenMarina Davila Ross

Abstract

Humans respond to unfair situations in various ways. Experimental research has revealed that non-human species also respond to unequal situations in the form of inequity aversions when they have the disadvantage. The current study focused on play fights in gorillas to explore for the first time, to our knowledge, if/how non-human species respond to inequities in natural social settings. Hitting causes a naturally occurring inequity among individuals and here it was specifically assessed how the hitters and their partners engaged in play chases that followed the hitting. The results of this work showed that the hitters significantly more often moved first to run away immediately after the encounter than their partners. These findings provide evidence that non-human species respond to inequities by trying to maintain their competitive advantages. We conclude that non-human primates, like humans, may show different responses to inequities and that they may modify them depending on if they have the advantage or the disadvantage.

References

Sep 19, 2003·Nature·Sarah F Brosnan, Frans B M De Waal
Feb 12, 2005·Proceedings. Biological Sciences·Sarah F BrosnanFrans B M de Waal
Oct 28, 2005·Nature·Joan B SilkSteven J Schapiro
Apr 22, 2006·Proceedings. Biological Sciences·Keith JensenMichael Tomasello
Oct 6, 2007·Science·Keith JensenMichael Tomasello
Dec 14, 2007·Biology Letters·Marina Davila RossElke Zimmermann
Dec 10, 2008·Proceedings of the National Academy of Sciences of the United States of America·Friederike RangeLudwig Huber

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Citations

Jun 12, 2013·Proceedings of the National Academy of Sciences of the United States of America·Sarah F Brosnan
Jun 6, 2014·Scientific Reports·Christopher Flynn MartinColin Camerer
May 12, 2016·PloS One·Jennifer L EsslerFriederike Range
Aug 31, 2019·Primates; Journal of Primatology·Raquel CostaMasaki Tomonaga
Sep 23, 2020·Biology Letters·Johanna EckertErica A Cartmill
Sep 4, 2021·American Journal of Primatology·Meghan J SosnowskiSarah F Brosnan

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