Fig. 6.

Concertina locomotion on flat horizontal surfaces. (A) Video images of a reticulated python (P. reticulatus, L = 197 cm). The flat, smooth surface was a sheet of Sintra^®Board, which had coefficients of forward and backward static friction of 0.17 and 0.22, respectively. (B) Schematic summary of EMGs for a Florida banded water snake (N. fasciata pictiventris, L = 100 cm) in a flat tunnel 10 cm wide based on Jayne (1988c). The outlines of the snake were traced from filmed images, and the areas shaded black indicate simultaneous activity of the ipsilateral SSP, LD, and IC muscle segments. The gray regions indicate static contact between the snake and surfaces.