Figure  S1 Geographical locations of the 1447 populations considered in the analysis. A total of 98 vertebrate species from five vertebrate clades were represented.

Figure  S2 Composite tetrapod phylogeny used for phylogenetic analyses in this study. The tree was compiled from several sources.

Table  S1 Characteristics of the data across clades used in this study: count of species, and the number, area and body mass of populations sampled. Maximum and minimum values per species are given in parentheses.

Table  S2 Analysis of intraspecific body mass variation, controlled for phylogeny (cf. Table  1; for tree, see Fig.  S2).

Table  S3 The best-fit model of intraspecific body mass variation, controlled for measurement type (cf. Tables  1 and 2).

Table  S4 Summary of Mantel tests and partial Mantel tests applied only to those species with direct body mass measurements (cf. Table  3), totalling 548 populations in five clades (N = 33 species).

Table  S5 The 98 species of tetrapods considered in the analyses with the number of populations sampled (n), the average of log10 body mass (mean), the standard deviation of log10 body mass (SD) and sources for the body mass information.

Appendix  S1 Phylogenetic analysis.

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