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Correspondence and requests for materials should be addressed to C.E.W. (email: cwebb218@gmail.com) or to T.R. (email: tromero@lincoln.ac.uk)
C.E.W. and T.R. designed the study and wrote the paper
C.E.W. and B.F. conducted the data analyses
F.B.M.d.W. provided long-term data and grant support.
All authors contributed feedback to and edited the manuscript.
We would like to thank Michael Seres and Filippo Aureli for the behavioural data collection of this study, and the animal care and veterinary staff at the Yerkes National Primate Research Center (YNPRC) for maintaining the health and wellbeing of the chimpanzees.
The authors declare no competing financial interests.
This work was supported by a National Institutes of Health National base grant to the YNPRC (RR-00165; currently supported by the Office of Research Infrastructure Programs/ODP51OD11132), Emory University’s College for Arts and Sciences, and the Living Links Center.
© The Author(s) 2017