Snails eat vegetables and other plants. But it is arbitrary to say that snails don't eat grass. After all, there are many kinds of grass, and grass is not a botanical term. It is difficult to define whether a plant is grass or not. For example, bamboo can be considered as grass and amaranth can also be artificial grass. But someone must disagree.

Slugs are called slugs (kuo4

Yu2 (numbers denote tones), slugs may eat like snails. Most mollusks have mucus on their body surfaces, and slugs are no exception.

Snails, slugs and snails all belong to Gastropoda of Mollusca.