The snail, which carries a shell on its back, crawls slowly and likes to stay on top of green plants. It also secretes some mucus, which facilitates the snail's movement and skin-assisted respiration. Some snails are poisonous and some are not. Overall snails are very weak and can be kept without direct harm to the human body.

But in extreme cases, snails can carry some viruses that can be risky on contact, and as long as they are kept in the right way, snails don't cause much trouble for their owners. Snails mainly harm bean seedlings, vegetables, melons and other crops, light will cause leaves, stalks broken, stiff seedlings late, the rate of seedling decline; heavy will eat all the bean seedlings, resulting in pieces of crops without seedlings.

In addition, snails are generally non-toxic, but contain a large number of parasites.