Fig. 8.

Forward center of mass (COM) velocity, hip angle and electromyogram activity of the flexor cruris lateralis pars pelvica (FCLP) and flexor cruris lateralis pars accessoria (FCLA) muscles during walking at a treadmill velocity of 0.5 m s^–1. The plot shows data from two consecutive strides. During the first stride, the bird decelerated, then accelerated forward during the second stride to maintain its position on the treadmill. Up and down arrows show the timing of toe-off and foot-down, respectively.