Probability of in relation to grooming given by potential handlers.

Negative maternal responses – mother left the area or moved her infant away from an approaching handler. Other independent variables are the number of infants per OMU female, the age of the infant and the rank difference between the mother and the handler. N = 897.母方负面反应指母方离开当前区域，或将幼崽移离靠近的实验操作者。其余自变量包括每只一雄多雌单元（One-male unit，OMU）雌性个体的幼崽数量、幼崽的年龄，以及母方与实验操作者之间的社会等级差异。样本量N=897。