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Fig. 3. Plot of heart rates (fH) of mammals at rest vs body mass Mb (data taken from Brody, 1945). The regression lines are fitted to the average of the logarithms for every 0.1 log unit interval of mass, but both the average (squares) and raw data (bars) are shown in the plots. The slope is -0.251 (P<0.0001, N=17, 95% CI: -0.221, -0.281), which clearly includes -1/4 but excludes -1/3. Figure taken from Savage et al. (2004b) with permission.