Article (Scientific journals)
Network analysis highlights socio-demographic patterns of stone tool-using primates
Giraud, Gwennan; O’Malley, Theo D. R.; Reeves, Jonathan S. et al.
2026 • In Scientific Reports, 16 (23720)
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Keywords :
Tool user; Long-tailed macaques; Grooming network; Social position; Preferential associations
Abstract :
[en] While the nutritional benefits and social learning of tool use in primates have been widely studied, far less is known about how tool use is associated with social life. We investigated the social aspects of tool use in a hybrid population of long-tailed macaques (Macaca fascicularis aurea × M. f. fascicularis) on Koram Island, Thailand, comprising both stone tool users and non-users. To assess potential socio-demographic patterns, we examined whether tool use differed between sexes and whether it was related to variation in dominance rank. Using social network analyses, we assessed whether tool users differed in their associations outside foraging contexts by analyzing their grooming interactions and positions within the grooming network. Males were more likely to use tools than females, whereas rank was unrelated to tool use. Tool users and non-users showed similar social connectivity, grooming rates, and numbers of grooming partners. However, grooming networks indicated that non-tool users preferentially associated with other non-users, whereas tool users showed no affiliative bias. By integrating individual characteristics with social network data, this study provides insight into how tool-use behavior integrates into primate social systems, particularly in populations with substantial variation in technological behavior.
Disciplines :
Animal psychology, ethology & psychobiology
Author, co-author :
Giraud, Gwennan  ;  Max Planck Institute for Evolutionary Anthropology > Lise Meitner Research Group Technological Primates
O’Malley, Theo D. R.;  Max Planck Institute for Evolutionary Anthropology > Lise Meitner Research Group Technological Primates
Reeves, Jonathan S.;  Max Planck Institute for Evolutionary Anthropology > Lise Meitner Research Group Technological Primates ; George Washington University > Department of Anthropology > Center for the Advanced Study of Hominin Paleobiology ; Universidade do Algarve > Interdisciplinary Center for Archaeology and the Evolution of Human Behavior
Tan, Amanda;  Durham University > Department of Anthropology
Sosa, Sebastian;  Max Planck Institute for Evolutionary Anthropology > Department of Human Behavior, Ecology and Culture
Malaivijitnond, Suchinda;  Chulalongkorn University > Faculty of Science > Department of Biology ; Chulalongkorn University > National Primate Research Center of Thailand
Luncz, Lydia V.;  Max Planck Institute for Evolutionary Anthropology > Lise Meitner Research Group Technological Primates ; George Washington University > Department of Anthropology > Center for the Advanced Study of Hominin Paleobiology
Language :
English
Title :
Network analysis highlights socio-demographic patterns of stone tool-using primates
Publication date :
01 August 2026
Journal title :
Scientific Reports
eISSN :
2045-2322
Publisher :
Springer Science and Business Media LLC
Volume :
16
Issue :
23720
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
Projekt DEAL
Funders :
LSB Leakey Foundation
Funding text :
Animal Behaviour Society
Available on ORBi :
since 01 August 2026

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