There has recently been huge growth in studies of social learning and culture (see Glossary) across 33 diverse species [1,2] successful individuals or copying the majority: [13,25]), much less attention has been devoted to 49 documenting and explaining individual variation in these phenomena within species, or among 50 groups of individuals (e.g. populations) within species. 51
52In experiments, typically the demonstration of social learning, or a particular mechanism or strategy 53 of social learning, in enough individuals or on enough trials to reach statistical significance leads to 54 the claim that this phenomenon is present in this particular species. The authors of one recent study 55