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Flexible branches in the primate family tree?

Published online by Cambridge University Press:  27 November 2025

Catherine Hobaiter Open the ORCID record for Catherine Hobaiter [Opens in a new window]  and
Nathaniel J. Dominy Open the ORCID record for Nathaniel J. Dominy [Opens in a new window]
Catherine Hobaiter*
Affiliation:
Wild Minds Lab, School of Psychology and Neuroscience, University of St Andrews, St Andrews, Scotland, UK clh42@st-andrews.ac.uk
Nathaniel J. Dominy
Affiliation:
Departments of Anthropology and Biological Sciences, Dartmouth College, Hanover, NH, USA nathaniel.j.dominy@dartmouth.edu
*
*Corresponding author.
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Abstract

Primate species deploy a suite of behavioural and cognitive adaptations to offset the costs of group-living. Dunbar uses species-level comparisons to posit a series of cumulative steps that describe large-scale phylogenetic patterns in the evolution of sociality. Here, we highlight the value of population-level variation within species for empirically testing the predicted socio-ecological correlations that underpin Dunbar’s hypothesis.

Information

Type
Open Peer Commentary
Information
Behavioral and Brain Sciences , Volume 48 , 2025 , e169
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Copyright
© The Author(s), 2025. Published by Cambridge University Press

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References

Antón, S. C., & Kuzawa, C. W. (2017). Early Homo, plasticity and the extended evolutionary synthesis. Interface Focus, 7(5), 20170004.10.1098/rsfs.2017.0004CrossRefGoogle ScholarPubMed
Badihi, G., Bodden, K., Zuberbühler, K., Samuni, L., & Hobaiter, C. (2022). Flexibility in the social structure of male chimpanzees (Pan troglodytes schweinfurthii) in the Budongo Forest, Uganda. Royal Society Open Science, 9(9), 220904.10.1098/rsos.220904CrossRefGoogle ScholarPubMed
Fannin, L. D., Seyoum, C. M., Venkataraman, V. V., Yeakel, J. D., Janis, C. M., Cerling, T. E., & Dominy, N. J. (2025). Behavior drives morphological change during human evolution. Science, 389(6759), 488–493.10.1126/science.ado2359CrossRefGoogle ScholarPubMed
Giuliano, C., Stewart, F. A., & Piel, A. K. (2022). Chimpanzee (Pan troglodytes schweinfurthii) grouping patterns in an open and dry savanna landscape, Issa Valley, western Tanzania. Journal of Human Evolution, 163, 103137.10.1016/j.jhevol.2021.103137CrossRefGoogle Scholar
Hall, K. R. (1966). Behaviour and ecology of the wild patas monkey, Erythrocebus patas, in Uganda. Journal of Zoology, 148(1), 15–87.10.1111/j.1469-7998.1966.tb02942.xCrossRefGoogle Scholar
Kappeler, P. M., & Watts, D. P. (Eds.). (2012). Long-term Field Studies of Primates. Springer Science & Business Media. Heidelburg.10.1007/978-3-642-22514-7CrossRefGoogle Scholar
Koops, K., Akankwasa, W., Camara, H. D., Fitzgerald, M., Keir, A., Mamy, G., … & Hobaiter, C. (2024). Flexible grouping patterns in a western and eastern chimpanzee community. American Journal of Primatology, 86(4), e23593.10.1002/ajp.23593CrossRefGoogle Scholar
Lehmann, J., & Boesch, C. (2004). To fission or to fusion: Effects of community size on wild chimpanzee (Pan troglodytes verus) social organisation. Behavioral Ecology and Sociobiology, 56, 207–216.10.1007/s00265-004-0781-xCrossRefGoogle Scholar
Lister, A. M. (2014). Behavioural leads in evolution: Evidence from the fossil record. Biological Journal of the Linnean Society, 112(2), 315–331.10.1111/bij.12173CrossRefGoogle Scholar
Loftus, J. C., Harel, R., Ashbury, A. M., Núñez, C. L., Omondi, G. P., Muttinda, M., … & Crofoot, M. C. (2024). Sharing sleeping sites disrupts sleep but catalyses social tolerance and coordination between groups. Proceedings of the Royal Society B: Biological Sciences, 291(2034), 20241330.10.1098/rspb.2024.1330CrossRefGoogle ScholarPubMed
Nishida, T. (1968). The social group of wild chimpanzees in the Mahali Mountains. Primates, 9, 167–224.10.1007/BF01730971CrossRefGoogle Scholar
Safryghin, A. (2024). Commonalities and group differences in the communicative efficiency of chimpanzee gesturing [Doctoral dissertation, University of St Andrews]. St Andrews Research Repository https://research-repository.st-andrews.ac.uk/handle/10023/28944 Google Scholar
Samuni, L., & Surbeck, M. (2023). Cooperation across social borders in bonobos. Science, 382(6672), 805–809.10.1126/science.adg0844CrossRefGoogle ScholarPubMed
Sandel, A. A., & Watts, D. P. (2021). Lethal coalitionary aggression associated with a community fission in chimpanzees (Pan troglodytes) at Ngogo, Kibale National Park, Uganda. International Journal of Primatology, 42, 26–48.10.1007/s10764-020-00185-0CrossRefGoogle ScholarPubMed
van Lawick-Goodall, J. (1968). The behaviour of free-living chimpanzees in the Gombe Stream Reserve. Animal Behaviour Monographs, 1, 161–311.10.1016/S0066-1856(68)80003-2CrossRefGoogle Scholar
Wilson, M. L., Boesch, C., Fruth, B., Furuichi, T., Gilby, I. C., Hashimoto, C., … & Wrangham, R. W. (2014). Lethal aggression in pan is better explained by adaptive strategies than human impacts. Nature, 513(7518), 414–417.10.1038/nature13727CrossRefGoogle Scholar