Fig. 3. Footfall diagrams of Terrapene carolina (individual 01) from bouts of treadmill locomotion. (A) Limb support (solid bars) and ventilatory airflow (red trace) during two bouts of locomotion. Note the short pause between the bouts of locomotion. (B) Polar diagram showing the relative timing of limb support (mean ± S.D.). Each solid bar represents a different limb and is shown in the same shade of grey as in the previous panel. Each stride cycle (from Fig. 3A) is normalized to 360° so that the end of left hindlimb support is always at 0° (top of circle) and the stride cycle proceeds clockwise.