The existing social groups of primates encompass, one-male, milti-female; one-female, multimale; multimale, multifemale; all male; one male, one female; and solitary. Usually the greater number of organisms in a group the greater increase of fitness since it provides easy access to food, alongside with protection therefore polygynous, and polyandrous groups have a greater chance of surviving and reproducing thus a greater fitness. On the other hand, solitary and monogamous groups have the unfortunate advantage of low numbers and therefore lack the protection and food advantages a group gives.
Learned behavior has become more advantages in the primate group because of several factors. First, learned behavior allows them for better access to food, such as the skill of cracking a nut with the use of two rocks. Alongside with that it also gives them social skills that are not instinctively, rather learned by the parent. With the social skills learned they can thus live in a group in which they are socially accepted and they have the benefits of protection and food. Alongside with that they also have the advantage of learning parenting skills which would increase the fitness of their offspring such as it did with