Recent and current research interests focus on social learning, traditions and culture. To elucidate the evolution of these phenomena I study and compare human and non-human primates, especially our closest living relatives, chimpanzees. Studies include both large scale surveys of behaviour in the wild and behavioural experiments with children and non-human primates. The latter studies include the first ones that track the diffusion of behavioural techniques experimentally introduced into existing groups. Development of social learning capacities is studied in children and juvenile non-human primates.