Fig. 3
From: Cultural conformity generates extremely stable traditions in bird song
Geographic variation in syllable sharing. a, b Show the amount of syllable sharing between individuals’ (n = 615) repertoires, measured using the Jaccard Index (proportion of shared syllable types out of all types found in a pair of individuals), against the geographical distance between them. a Syllable sharing was high within populations, with no significant within-population geographic structure, but much lower between populations. b Syllable sharing was similar between the six populations sampled
