Fig. 12. Performance and velocity polar diagrams (following Tucker, 1998) for two trajectories, representing a small snake (circles; M=11 g, SVL=47 cm) and a large snake (triangles; M=83 g, SVL=85 cm). The straight lines indicate speed combinations resulting in constant glide angle. (A) Performance diagram. The larger snake had a higher initial airspeed and greater rate of sinking speed increase. Sinking speed increased in linear fashion until reaching transition, which occurred at a higher airspeed for the larger snake (arrow). (B) Velocity polar diagram.