Abstract
One goal of environmental enrichment in zoo is to make the behavioral repertoires and the activity budgets of captive animals as close to those of wild animals as possible. This study first described the behavioral patterns of 5 chimpanzees reared at the Maruyama Zoo, Sapporo, Japan. The observation was taken place in 1996 using focal animal sampling method. This result elucidated that zoo chimpanzees exhibited extremely different behavioral patterns compared with wild counterparts. Especially the duration of feeding behavior was much less. Therefore, this study further attempted to increase the duration of feeding by the control of the frequency of feeding provision during a day. This experiment showed that, even though total volume of food was equal, multi-frequency feeding is more effective for the prolongation of feeding time than single operation.
