Predicted values of ultimate body mass of FR animals, MFR = M × (β × B0/B0,FR)4/3, against the empirical values. (Empirical data are in table S1 of the electronic supplementary material.) Black filled squares, predictions based on scaling power = 3/4; solid line, y = 0.98x (fixed intercept = 0; r2 = 0.99; 95% CI: 0.96, 1); red open circles, predictions based on scaling power = 2/3; dashed line, y = 0.94x (fixed intercept = 0; r2 = 0.99; 95% CI: 0.92, 0.97).