Fig. 8. Axial compression, cranial–caudal axial bending, and cranial and caudal shear strains versus body mass on logarithmic axes for (A) the femur and (B) TBT. Closed squares, axial compression; closed circles, cranial–caudal axial bending; closed diamonds, cranial shear strains; open diamonds, caudal shear strains. In A, given the non-linearity of the trends for the femur, even on logarithmic axes, regression equations were not calculated. In B, axial compression, y=–46x^{–0.52±0.27} (R²=0.48, N=14); cranial-caudal axial bending, y=181x^0.38±0.30 (R²=0.38, N=14); caudal shear, y=–212x^{–0.66±0.22} (R²=0.69, N=11). In B, the slopes and 95%CIs of the power lines for the axial compressive and caudal shear strains were taken on the absolute values of these strains, but plotted in the figure on the negative values for clarity. As multiple trials at this DF were not collected for all birds, error bars have been omitted for consistency.