Fig. 7. Effects of femur retraction (B), femur rotation (C) and knee angle (D) on the length (A) of the caudofemoralis muscle of a Dipsosaurus dorsalis. The data shown are from one of the three individuals for which the hindlimb was manipulated while the lizard was anesthetized. The strain of the caudofemoralis muscle is expressed as a percentage change from its resting length (L₀).