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Fig. 2. The effects of perch incline on locomotor mode and movement. The tracings
are from dorsal view videos of a corn snake (SVL=102 cm, mass=400 g, 4.1 cm
perch) and show seven consecutive images at equal time intervals within a
single cycle of concertina locomotion (A,B). The downhill sequence (C) is for
the same total time as A. The shaded areas indicate static contact with the
perch. (A) Uphill 90°. (B) Horizontal. (C) Downhill 90°. The times
between successive images of B and C are 0.53 s, and 0.7 s for A.