1. Primatology Centre of Strasbourg University; Fort Foch; 67207; Niederhausbergen; France
2. Laboratoire Psychologie de la Perception; Université Paris Descartes; CNRS UMR 8158, 45 rue des Sts Pères; 75006; Paris; France
3. Laboratory of Cognitive Psychology; Aix-Marseille University; 3 Place Victor Hugo; 13331; Marseille Cedex 1; France
4. Instituto de Biologia; Universidad Nacional Autonoma de México; Mexico City; Mexico
5. Centre for Research on the Psychology of Cognition; Language and Emotion; Aix-Marseille University; 29 avenue Robert Schuman; 13621; Aix-en-Provence Cedex 1; France