What name is given to the side-to-side movement snakes use on loose sand?

Sidewinding is the side-to-side movement snakes use to travel efficiently across loose sand.

During sidewinding, a snake lifts parts of its body while sending waves of movement through it. Only a few sections touch the ground at a time, creating a sequence of narrow tracks angled across the direction of travel. This reduces the amount of body surface sliding against unstable sand.

The technique is especially associated with desert vipers, including sidewinders and some Saharan and Namibian species. It can also help a snake cross very hot surfaces by limiting contact with the ground.

Sidewinding is one of several snake locomotion methods. Lateral undulation is the familiar winding movement used on firm ground, concertina locomotion uses alternating grips in confined spaces, and rectilinear locomotion moves the body in a straighter line.