Fig. 2. Representative force traces and kinematic diagrams for a steady-speed run (A) and a high acceleration (B). High accelerations involved high peak propulsive horizontal forces (dotted lines), no braking horizontal forces and a delay in vertical force (solid line) development. The insets in the force graphs represent the mean orientation of the ground reaction force vector during stance. The turkey diagrams illustrate the changes in limb angle during acceleration that help to maintain the alignment between the forward-oriented ground reaction force (bold arrow) and the center of mass. These diagrams were traced from video frames at the times indicated by arrows on the force graphs. The gray shaded circle represents the approximate location of the animal's center of mass.