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Authors
Prieur, Jacques http://orcid.org/0000-0003-0674-1750
Pika, Simone
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Funding
Funding for this research was provided by:
Alexander von Humboldt-Foundation
Deutsche Forschungsgemeinschaft (407023904)
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Article History
Received: 18 July 2019
Accepted: 13 February 2020
First Online: 12 March 2020
Compliance with ethical standards
:
: The authors declare no competing financial and/or non-financial interests in relation to the work described.
: In an effort to avoid influencing the natural behaviour of individuals and group, our study was purely non-invasive, with audio and video recordings taken from a minimum distance of 5 m. The research adhered to the legal requirements of the Netherlands and followed the recommendations of the Animals (Scientific Procedures) Act 1986, as published by the government of the United Kingdom, and the Principles for the ‘Ethical Treatment of Non-Human Primates’, as stated by the American Society of Primatologists. Permission to conduct research at the Apenheul Primate Park was granted by F. Rietkerk.
