FIGURE 3.

Ages of acquisition of critical elements for chimpanzees at Goualougo. Values are means and error bars represent standard deviation. Sample sizes are given for each sex in parentheses (female, male). Females and males acquired critical elements at comparable ages, though females acquired all critical elements except “Manufacture brush‐tipped fishing probe” before males. Compared to acquisition ages for single tool use, ages at which the use of tool sets were first observed were more variable