Fig. 8. Overhead and side views of postural changes through time in one trajectory. Lines represent the connections between the head, midpoint and vent, as in Figs 1 and 3. Postures are aligned by the midpoint, with the gray arrows representing the snake's forward direction of travel along the trajectory; temporal sequence is from left to right. The two gaps represent missing data. One full undulatory cycle is represented between the two dotted lines. In every cycle, the posterior segment swung lower than the anterior segment and sometimes passed in front of the midpoint. This part of the cycle (black bars) accounted for approximately half the cycle. (M=27 g, SVL=63 cm.)