Eight experiments investigated tool-use in an adult male-female pair of capuchin monkeys. Cebus apella. Both subjects used sticks to probe into a closed box in order to extract honey contained therein, and both showed appropriate choices when selecting from an array of sticks of different thickness. The male readily modified sticks which were too thick, and used such sticks to rake in appropriate honey-dipping sticks lying out of reach. Neither subject constructed and used tools from elements which could be joined together, although the male performed the joining component. The male, but not the female, straightened out bent wire in order to form a honey-dipping tool. The female showed less overall object-oriented behaviour, but profited from the male's tool-use. The results of some of the experiments suggest mental representation of the tool-using task and its solution, and indicate the importance of individual « social strategies ».Resume. -Huit series d'experiences concernent I'utilisation d'outils chez un couple de singes capucins adultes (Cebus apella). Les deux sujets, male et femelle, utilisent des batons qu'ils introduisent dans des trous perces sur le couvercle d'une boite pour recuperer le miel qu'elle contient, choisissant l'outil approprie parmi des batons de differents diametres. Le male modifie immediatement les batons trop epais en les taillant avec ses dents, ou utilise ces batons pour rapprocher de lui des batons de la bonne taille/epaisseur mais places hors d'atteinte. Aucun des deux ne construit ni n'utilise d'outils faits ä partir d'elements qui s'emboitent, bien que le male manipule les parties ä assembler. Le male parvient ä eurer du fil de fer emmele pour en faire un outil a tremper dans le miel; la femelle n'y arrive pas. Celle-ci montre moins de comportements directement Orientes vers 1'objet mais profile du travail effectue par le male. Les resultats suggerent une representation mentale des täches impliquant I'utilisation d'outils et mettent 1'accent sur l'importance de strategies sociales individuelles.
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