Abstract
Breeding activities of Pig-tailed Macaques (Macaca leonina) were studied from May 1996 to September 1997 in the West Bhanugach Forest Reserve of Bangladesh. This species is not a seasonal breeder and breeding activities and birts were recorded throughout the year. Swelling of the sexual skin is most important signal of female receptivity in this species. Both copulatory and non-copulatory mounts were observed. Most copulation were single mount (66.3%) and some were multi-mount. Overall, 62% adult females of the study area gave birth during this period.