Primate social group sizes exhibit a regular scaling pattern with natural attractors.

Cross-tabulating these rate clusters with the group size clusters from figure 1 yields a highly significant non-random pattern of association (electronic supplementary material, table S1; χ 2 = 139.7, d.f. = 9, p << 0.0001), with a significant positive correlation between the two classifications (Kendall's τ = 0.685, N = 170, p << 0.0001). 4.

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