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Figure S1 A colored graphical representation of the log brain mass vs. log body mass plot (Fig. 1a)

Figure S2 A graphical representation of the relationship between log brain mass vs. log body mass in our adult female dataset (n = 130), linear regression analysis demonstrated a significant relationship (F1,128 = 1283, slope = 0.68, r2 = 0.909, P < 0.0001) between body mass and brain mass.

Figure S3 To take phylogeny into consideration, we have calculated the EQ based on three regression lines, the log brain vs. log body regression line of Fig. 1a, the independent contrast regression line of Fig. 1b and the PGLS regression line.

Figure S4 A comparison of the mean and range of EQs for the 21 different mammalian orders for the log brain vs. log body regression line derived EQ (A), the independent contrast derived EQ (B), and the PGLS derived EQ (C)

Figure S5 A comparison of the mean and variance distributions of EQ in primate sister clade pairs, for the log brain vs. log body regression line derived EQ (A, B, C), the independent contrast derived EQ (D, E, F), and the PGLS derived EQ (G, H, I)

Figure S6 A comparison of the mean and variance distributions of EQ in cetartiodactyl clades, for the log brain vs. log body regression line derived EQ (A, B, C), the independent contrast derived EQ (D, E, F), and the PGLS derived EQ (G, H, I)

Table S1 Brain mass, body mass, and EQ dataset of 630 mammals

Table S2 PGLS phylogenetic signal (λ) values from BayesTraits

Table S3 Summary of parsimony and REML ancestor value reconstructions for key nodes

Table S4 Ancestral reconstruction of body mass, brain mass, and EQ for REML

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