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Fig. 4. Trajectory and glide angle summary plots. Fourteen trajectories, each from
a different snake, are shown. (A) Side view of trajectories. Data are
unsmoothed 3-D coordinates sampled at 30 Hz, rotated about the average heading
angle prior to plotting. The gray shading represents the range of trajectory
space of the trials. Trajectories are similar in the first 5 m of vertical
drop and then diverge, with the snakes shallowing at different rates. (B)
Pooled glide angle through time. Each box represents the standard quartiles of
the pooled distribution of all 14 trajectories at each time interval. Error
bars represent 10th and 90th percentiles, respectively. The dotted line
represents the glide angle of a theoretical projectile launched with an
initial horizontal velocity of 1.7 m s-1. For the snakes, glide
angle began near zero, increased rapidly and deviated from the theoretical
projectile early, approximately where aerial undulation began.
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