Snakes are limbless reptiles with a skeleton that consists of a skull and an elongated spinal column with between 200 to 400 vertebrae of which  to most a set of ribs is attached. This backbone is in Thai known as kradook ngu.

Snakes have a very flexible lower jaw,  of which the two halves are not rigidly attached, as well as numerous other joints in their skull, that allow them to open their mouths wide enough to swallow their prey whole.