Читать книгу The Circle of Knowledge: A Classified, Simplified, Visualized Book of Answers - Various - Страница 279

The vertebrae are very numerous. With the exception of the most anterior (atlas), all bear ribs, which are very freely movable and are the snake’s main organs of locomotion. Snakes are capable of moving with great swiftness. The body undulates from side to side—not up and down—in a wriggling or writhing fashion. The extremely flexible backbone permits of this, but to guard against dislocation the vertebrae are connected by extra locking-joints, which only permit a certain amount of play. It is, however, comparatively easy to break the back of a snake by a sharp blow with a stick or whip.