Group size can play major impact on captive primate species in terms of their behaviour and adaptive mechanism. For instance; unfitting sized groups, both too small and too large, can lead to them facing negative consequences on the behaviour, welfare and reproduction of captive animals (E.E Price, T.S Stoinski, Applied Animal Behaviour Science 103, 2007 p258). For instance; normally social animals that are kept in social isolation has shown in studies to be associated with high levels of stereotypic behaviours, incompetent social and reproductive behaviours, and chronic stress (Carlstead, 1996; Deni and Erwin, 1979; Lewis et al 2000; Meder and Watts, 1996). } {There is great amount of studies on the effects of group size on Social behaviour