Snails belong to an animal group called Gastropoda, although Gastropoda is best known as a plant-eating pest. However, most of about 72,000 species live in the oceans of the world. The largest number are carnivorous predators, and some use their powerful toxins to stun their prey. Gastropoda, together with cuttlefish, octopus, clam and oyster, belong to the same animal class, called mollusca. Like most mollusks, gastropods have soft bodies protected by shells. Gastropods also have muscle "feet" that can crawl around and have tiny teeth on their tongues that can scrape food. There are three main types of gastropods: sea snails, sea cucumbers and terrestrial snails and slugs.

Courtyard snail

The garden snail has become a very harmful pest. Every night or after a heavy rain, they will come out for food and often bite off plants. When the weather is dry, they shrink in the shell and seal the opening of the shell with a dried and hardened mucus. Like many kinds of slugs and snails, garden snails have both male and female reproductive organs, so any two snails can mate and reproduce.

Spirulina gigantea

The great red snail tower is high, the body layer is large, and the top of the shell is often defective. The shell mouth is large and the screw shaft is smooth. There are large tumors arranged spirally around the periphery of the spiral layer and the shoulder of the body layer, and the shell surface is light red or cream.

African snail

The scientific name of the African giant snail, Heyun Mayao snail, which is often referred to as the Babylonia snail and the French snail, is a large-scale terrestrial shellfish that reproduces rapidly. They are the largest land snails in the world, weighing 800 grams, and their shells are 20 centimeters long. The African snail is sometimes regarded as a kind of food. Recently, this snail has become one of the biggest hazards in Southeast Asia.