Bonnet macaque females 3.5 to 4.5 kg. Captive monkey can live up to 35 years. The bonnet macaque feeds on fruits, nuts, seeds, flowers, invertebrates, and cereals. In southern India, this macaque exists as commensal to humans, feeding on food given by humans and raiding crops and houses. Two subspecies of bonnet macaques have been identified: "M. r. radiata" and "M. r. diluta". The bonnet macaque has a very wide range of gestures and behaviors, which can be easily differentiated. Lip smacking is one of the most common affiliative behaviors, where one individual may open and close its mouth in rapid succession,
Celebes crested macaque Paignton Zoo are among a number of mostly European zoos which hold "ex-situ" breeding populations of this animal. Since 2006, the "Macaca Nigra Project" has been studying the biology and promoting the conservation of this species. The project, a collaboration between the German Primate Center and the Bogor Agricultural Institute, is run by Antje Engelhardt and located in the Tangkoko reserve, home of the biggest crested macaque population remaining in the species' original distribution range. Nevertheless, despite being critically endangered, crested black macaque are still being hunted down and slaughtered. Crested black macaque is considered a delicacy by local residents.