Abstract
Activity budgets of wild female chimpanzees (Pan troglodytes schweinfurthii) in three reproductive states (estrous, anestrous, lactating) were compared with each other. Three lactating females, five anestrous females and seven estrous females in Mahale Mountains National Park, Tanzania were the subject of focal sampling and time spent for feeding, resting and moving was examined. For each of three categories of activity, there was no significant difference of time spent between each reproductive state. Those females spent about 40% of their daytime for feeding, about 30% for resting and about 40% for moving. One of the reasons of indifference might be the type of parties which females attended when they were observed. In most cases the females were seen in bisexual parties. Lactating females are expected to need more nutrition than cycling females and it might affect their activity budget. But the party type they attended might also affect the budget.
