Abstract
The time-budget of a captive group of crab-eating monkeys (Macaca fascicularis) has been established for every age-and sex-category. Several activities can be considered as characte¬ ristic of certain categories. A number of activities occurred at the same time in different age-and sex-categories, while others, such as rest and locomotion, took place simultaneously in the whole group. Simultaneous grooming was most often observed among juveniles of both sexes and adult females. The time-budget of the captive crab-eating monkeys did not differ greatly from that of free-living groups of other species. This might suggest that the roles of the various age-and sex-categories are much more influenced by social parameters than by environmental ones. The “structure of attention” as defined by Chance (1967) might be one of the factors involved in the differentiation of the social roles and in the synchronization of activities.
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