Conséquences comportementales de perturbations sociales répétées sur une troupe de Mones de Lowe Cercopithecus campbelli lowei de Côte-d’Ivoire

New observations have been made on the troop of Mona monkeys previously studied at Adiopodoumé, Ivory Coast, by Bour- lière et al. (1969-70) and Hunkeler et al. (1972). Following repeated poaching episodes, a young male leader took over the control of the residual troop in 1977. During this take over, the new male leader became very aggressive at the time the females gave birth (August and September). All of them were seriously hurt, together with their young infants which subsequently died. Such a behaviour suggest deliberate infanti cide. A depressive syndrome has also been observed in a peri pheral isolated subadult male, including auto-aggression