Fig. 5. Percentage of the total 90° of head/neck and postcranial body rotation that occurred during each phase of the stride cycle. Head/neck (open bars) and body (filled bars) rotation were the changes in the angles made by markings 1 and 2 and 2 and 4 with the horizontal, respectively. Flight phase 1 occurred between hindlimb takeoff and forelimb plant and flight phase 2 occurred between forelimb takeoff and hindlimb plant. Most stride cycles contained one of the two flight phases but not both. Values are means ± S.E.M. for the six mice.