[1] Univ Strasbourg, Inst Pluridisciplinaire Hubert Curien, Strasbourg, France
[2] CNRS, Dept Ecol Physiol & Ethol, Strasbourg, France
[3] Ecole Normale Super, F-75231 Paris, France
[4] Univ St Andrews, Ctr Social Learning & Cognit Evolut, Sch Psychol & Neurosci, St Andrews, Fife, Scotland
[5] Mawana Game Reserve, Inkawu Vervet Project, Swart Mfolozi, Kwazulu Natal, South Africa
[6] Kyoto Univ, Primate Res Inst, Ctr Int Collaborat & Adv Studies Primatol, Inuyama, Aichi 4848506, Japan
[7] Kyoto Univ, Wildlife Res Ctr, Sakyo Ku, Kyoto 6068203, Japan
[8] Ethobiosci, Res & Consultancy Agcy Anim Wellbeing & Behav, Strasbourg, France
[9] Univ Calgary, Dept Anthropol, Calgary, AB T2N 1N4, Canada
[10] Univ Neuchatel, Inst Biol, CH-2000 Neuchatel, Switzerland
[11] Georgia State Univ, Dept Psychol, Atlanta, GA 30302 USA
[12] Georgia State Univ, Language Res Ctr, Atlanta, GA 30302 USA
[13] Univ Calif Davis, Dept Anthropol, Davis, CA 95616 USA
[14] Smithsonian Trop Res Inst, Panama City, Panama
[15] German Primate Ctr, Behav Ecol & Sociobiol Unit, Gottingen, Germany
[16] Univ Gottingen, Courant Res Ctr Evolut Social Behav, Gottingen, Germany
[17] Lincoln Pk Zoo, Lester E Fisher Ctr Study & Conservat Apes, Chicago, IL 60614 USA
[18] UT MD Anderson Canc Ctr, Michale E Keeling Ctr Comparat Med & Res, Bastrop, TX 78602 USA
[19] Univ Libre Bruxelles, Unit Social Ecol, B-1050 Brussels, Belgium
[20] ISTC CNR, Unit Cognit Primatol, Rome, Italy
[21] ISTC CNR, Ctr Primate, Rome, Italy
[22] German Primate Ctr, Cognit Ethol Lab, Gottingen, Germany