We consider traditions to be between-group differences that are inherited over time due to social learning. To quantify to which extent between-group differences are inherited we combined (1) a measure of within-group repertoire similarity across time, and (2) a measure of between-group differences in repertoires at a given point in time. Within-group similarity across time on its own is insufficient for identifying inheritance, since next to social learning, within-group similarity can also be generated if all individuals converge on feeding on the same high quality resources due to repertoire optimization. Thus we needed to establish that the group-level repertoires that were maintained over time were distinct from those of other groups, hence ruling out population-level convergence due to factors such as repertoire optimization.