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Fig. 7. Photographs of postural changes during aerial trajectory. (A) Ballistic
dive, ventral view. Silhouettes composited from four consecutive photographs
(200 ms intervals) of a snake (M=36 g, SVL=69 cm) at the beginning of the
trajectory. Temporal sequence is from bottom to top. The white arrow shows the
location of the first traveling waving formed by the snake; in successive
silhouettes this wave can be seen moving posteriorly down the snake. The
snake's side-to-side width increases and head-to-tail length decreases as the
`S' is formed. Scale bar, 10 cm; because the snake moved closer to the camera
during the sequence, scale bar only applies to first silhouette. (B,C) Early
shallowing glide phase, lateral view. In the vertical axis, the vent moves
upward relative to the head and midpoint; in the lateral axis, the head moves
to the right and the vent moves to the left relative to the snake's fore-aft
axis. Interval between frames is 250 ms. (M=28 g, SVL=63 cm.) (D) Late
shallowing glide phase, posterolateral view. The anterior body is
approximately parallel with the ground and the posterior body is angled
downward. The white paint marks are the midpoint and vent landmarks. (M=68 g,
SVL=82 cm.)
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