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. The body is slender, the limbs are degenerated, there are no movable eyelids, no ear holes, no limbs, no front legs, and the body surface is covered with scales. Snakes are warm-blooded animals with a lower body temperature than humans. They are also called cold-blooded animals. When the ambient temperature is lower than 15℃, the snake will go into hibernation. Some are poisonous, but most are nontoxic. In addition, there is a "snake" in the "Zodiac".