Snakes have four ways of moving. The first one is the concertina method. This is when the snake bunches itself up and then throws itself forward. The wavelike motion which most people imagine when they think of snakes is called serpentine motion. This way of moving does not work on slick surfaces like glass. A third method is the sidewinding, whereby the snake lifts the middle of its body up and then pushes it down making its head move forward. The fourth kind of movement snakes use is the straight slow, creeping movement. To achieve this snakes use some of the wide scales on their underbelly, with which they grip the ground, while pushing forward with the rest scales.
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