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The pattern of increased body size in colder climates, or Bergmann's rule, is common in endotherms. However, empirical support has been mixed among clades, and it varies among taxonomic levels. Taking advantage of greatly improved phylogenetic resolution among rodents, we tested Bergmann's rule using 19 bioclimatic variables, and body mass data, for 1315 species on a recent supermatrix phylogeny....
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