Abstract
From the standpoint of the possible development of an optimal foraging strategy, the time allocation to different food patches and the decision as to when to leave any given patch were examined in wild Japanese monkeys (Macaca fuscata). The investigations yielded the following results: (1) There was no tendency for feeding bouts to be of longer duration in higher-quality patches, i.e. the monkeys did not employ an energy-maximizing strategy during their feeding bouts. (2) The speed of feeding barely decreased with passage of time during a bout. In most cases, therefore, a decrease in feeding speed was not considered relevant to the decision to leave a patch. These findings are evaluated in terms of social factors, and it appears that following a monkey's own family group or the troop usually contributes to the timing of leaving a food patch.
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