Abstract
Affiliative interference in mounts was studied in a group of Tonkean macaques (Macaca tonkeana) living in semi-liberty. Over a 4-year period, 545 sexual and noncopulatory mounts accompanied by 367 instances of interference were recorded using behavior-dependent sampling. Interference by immature individuals was frequent and occurred mainly when the mother was the mountee. Interference by adult females was less common. Various behavior patterns were displayed in interference, mainly directed toward the mounter. Aggression by the latter was rare. However, interference occurred from further away with increasing age of the interfering individual. It is suggested that interference represents an attempt to be involved in interactions with influential individuals. Comparisons with other species support the hypothesis that the development of interference is related to species-typical social relationships and, in particular, that frequency and intensity of interference are determined by the tolerance of adult males.
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