Snails are mollusks of the family Snails, with over 25000 known species worldwide. Snails have a soft body with a spiral shaped outer shell, and their body is divided into a head and feet; There are 2 pairs of antennae on the head, 1 pair of longer antennae on the back, and 1 pair of eyes at the top of the antennae. There are jaws and file shaped teeth in the mouth, which are used for chewing and chopping food; The abdomen and feet are flat and secrete mucus at the bottom, making it convenient for the feet to use muscle contractions to glide on different surfaces. Breathing occurs in tissues similar to lungs, and air enters through the inhalation port. Snails are named because they have two horn like antennae on their heads when crawling.