Ecology, diet, and social patterning in Old and New World primates

For a given primate species, the groups are more or less important not only in relation to their biomass and available food but also according to particular conditions of the environment (for example scattering of vegetal food species). The cohesion of large groups is due to the emergence of ritualized displays that make possible tolerance between the adults, male or female. It is not possible to say whether ethological evolution of the social structures came from particular pressures of ecological conditions or if the adaptation to the environment followed these socioecological changes. Wbat is certain is that correlation between those two conditions allows the survival of the different species