1. Primate Social Evolution Group; Courant Research Centre Evolution of Social Behaviour, Georg-August-University, Göttingen; 37077; Göttingen; Germany
2. Endocrinology Laboratory; German Primate Center; 37077; Göttingen; Germany
3. Courant Research Centre Evolution of Social Behaviour; Georg-August-University; Göttingen; 37077; Göttingen; Germany