Why do snails appear after rain?

Snails belong to Polypodiaceae because they are mollusks. They like wet and humid living environment, so they will appear after the rain.

In daily activities, you should use a lot of mucus with high water content to peristalsis and keep your body moist. When the weather is dry, they will hide under cool walls, roots or grass, shrink the meat into the snail shell to sleep, and seal the opening of the snail shell with mucus.

Once it rains, the ground will be wet, and the rain will pour into the snail shell and soak the mucus at the opening of the snail shell. It will wake up the dormant snails, because this is also the most favorable weather for snail activities. So there will be a phenomenon that snails appear in groups after the rain.