Fig. 1. Slow (A) and fast (B) locomotion in Kassina. The numbers represent time (s) for both columns of video images. The vertical columns of images show a typical slower speed (0.12 m s^-1) trial and a typical faster speed (0.21 m s^-1) trial of an individual. The widths of all frames are identical. Each column shows one complete stride, beginning and ending with the right forelimb contacting the ground. A mirror placed at an angle shows a simultaneous dorsal view to allow visibility of all four limbs simultaneously. The asterisk (^*) and plus (+) symbols represent corresponding stages of the slow and fast strides. Supplementary movies are available on-line.