Chimpanzee violence is known. The Gombe Chimpanzee grouphunts about 100 red columbus monkeys a year. The monkeys also demonstrate altruism. Social organization 3. Reproductive strategies 4.
Altruism is a characteristic kin groups.
Altruism and kin-selection is a component of all primate behaviour. Sexual dimorphism in primates is associated with sexual selection. By this measure, some non-human primates have culture. Chimpanzee tool use. Koko had only ever seen pcitures of alligators.