Snakes have many meanings. Snakes generally mean luck, auspiciousness and sacredness, cunning and coldness, mystery, longevity, cleverness and so on. Snakes are the general name of reptiles with degenerated limbs, belonging to the order Reptiles. Like all reptiles, snakes are covered with scales. All snakes are carnivores. At present, there are more than 3000 kinds of snakes in the world.

Snake (scientific name: Serpenthes) is an animal under Chordata and Reptiles. The body is slender and divided into three parts: head, trunk and tail. There are no limbs or claw-like hind limbs on both sides of the transverse fissure of the lower snake. The whole body is covered with scales; The head has different shapes, and the nostril is located on the snout side, but the Hydraceae species that live in the sea for life are located on the snout back; There is protective transparent skin outside the eyeball, the pupil is round, vertical oval or horizontal oval, there is no movable eyelid, and the crystal is almost spherical; The tongue is slender and forked; The premolars (only snakes in the family Serpentidae have teeth), maxilla, palatine bone, pterygoid bone and dentate bone of snakes are attached with teeth with curved tips, but the size, number and structure of teeth vary with different snake species. The tail is obviously shorter than the head.