Animal Cognition

, Volume 13, Issue 2, pp 239–248 | Cite as

Signals use by leaders in Macaca tonkeana and Macaca mulatta: group-mate recruitment and behaviour monitoring

  • Cédric Sueur
  • Odile PetitEmail author
Original Paper


Animals living in groups have to make consensus decisions and communicate with each other about the time, or the direction, in which to move. In some species, the process relies on the proposition of a single individual, i.e. a first individual suggests a movement and the other group members decide whether or not to join this individual. In Tonkean (Macaca tonkeana) and rhesus macaques (Macaca mulatta), it has been observed that this first individual displays specific signals at departure. In this paper, we aimed to explore the function of such behaviours, i.e. if these behaviours were recruitment signals or only cues about the motivation of the first departed individual. We carried out temporal analyses and studied the latencies of the first departed individual’s behaviours and of the joining of other group members. We also assessed whether the social style of a species in terms of dominance and kinship relationships influenced the patterns of signal emissions. We then analyzed how the first departed individual decided to make a pause or to stop it according to the identities of group members that joined the collective movement. Results showed that Tonkean macaques and rhesus macaques seemed to use back-glances to monitor the joining of other group members and pauses to recruit such individuals. This was especially the case for highly socially affiliated individuals in Tonkean macaques and kin-related individuals in rhesus macaques. Moreover, back-glances and pauses disappeared when such individuals joined the first departed individual. From these results, we suggested that such behaviour could be considered intentional. Such findings could not be highlighted without temporal analyses and accurate observations on primate groups in semi-free ranging conditions.


Decision-making Collective movement Intention Macaque Social style Kinship 



The authors are grateful to J. Dubosq, V. Wyss, H. Roger-Bérubet and A. Coulon for their help, P. Uhlrich, for technical assistance, N. Poulin for statistical advices and R. Knowles for English corrections. This work was supported by the French Research Ministry (EGIDE), the French Foreign Ministry (Lavoisier Excellence Scholarship) and the European Doctoral College of Strasbourg Universities. Thanks are extended to J. L. Deneubourg and B. Thierry for scientific discussions. These experiments comply with the current laws of the country in which they were performed.


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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  1. 1.Departement d’Ecologie, Physiologie et EthologieCentre National de la Recherche Scientifique & Université de StrasbourgStrasbourgFrance

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