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Pour caracteriser l\'environnement social et ecologique du Colobe Vert (Procolobus verus), des observations regulieres par tranche de 15 minutes d\'animaux focaux dans trois groupes ont ete mene. Les observations et les enregistrements de cris occasionnels (Ad libitum) ont permis de repertorier huit (8) types de cris unitaires emis par differentes classesde sexes et d\'âges. Ces cris peuvent etre regroupes en quatre categories selon les contextes sociaux dans lesquels ils interviennent : les cris a, b et c en cas de predation et de trouble (presence de predateur, cris d\'alarme d\'autres especes), les cris f et g en situation de conflit (combat entre individus), les cris b, c et e en contexte de stabilite (calmeapparent), et les cris b, c et e pour signaler des rencontres inter-groupes (rencontre avec d\'autres groupes de singes). In order to knod how Olive Colobus monkeys (Procolobus verus) interact with their social and ecological environment, we carried out regular observations by 15 minutes old section of focal animals in three groups. These observationsassociated with the recordings of occasional calls (Ad libitum) enabled us to index eight (8) types of unit calls emitted by various sex and age classes. These calls can be gathered into four types according to social contexts in which they happened : the calls a, b and c in context of predation and disturbance (presence of predator, alarm calls from other monkey species), the calls f and g in a situation of conflict (fights between individual), the calls b, c and e as a signal of stability (peaceful context), and the calls b, c and e in case of intergroup encounters (encounter with other monkey groups). Keywords : Colobe Vert, vocalisation, cri unitaire, contexte social, communication, Parc National de Tai, Cote d'Ivoire. Olive Colobus, vocalization, unit call, social context, communication, Tai National Park, Ivory Coast. Sciences & Nature Vol. 4 (2) 2007: pp. 137-147

Répertoire et contextes sociaux des cris unitaires du colobe vert (procolobus verus) dans le Parc National de Taï (PNT), Côte d\'Ivoire