Movie 1

The effects of three-dimensional trajectory on movement and muscle activity of a brown tree snake (Boiga irregularis) bridging gaps. Note the large amounts of muscle activity for trajectories that were horizontal compared to vertically upward and downward. Unlike the trajectories with zero yaw, when turning to the right or left in a horizontal plane, the muscle activity on the left and right sides was asymmetric. For horizontal trajectories the largest amounts of muscle activity were usually associated with crossing the edge of the initial perch.