so, the body follows a constant path (like lateral undulation, but unlike tunnel concertina locomotion). It then forms anterior grips and pulls the body forward, again demonstrating the 'path following' characteristic. Unlike tunnel concertina locomotion, this mode avoids any obstacle which falls between the bends of the snake's body. However, it is exceptionally slow, with snakes rarely moving faster than 2% of their length per second. Some snakes use a "lasso-climbing" technique to climb vertically by wrapping around the vertical object, including poles intended to stop predators. References Terrestrial locomotion