Snail have different types of slime which is a mucus secreted by glands:
- Body slime to keep the animal moist and to prevent it drying out.
- Slime to move along on to protect its foot from damage the snail secretes a continuous trail of slime. This leaves what we often see as a snail trail. This is secreted from glands under the mouth. The slime has also adhesive properties which allows the snail to climb trees and walls and attach to a variety of surfaces.
Snail slime was once used as medicine from Ancient Greece to the Middle Ages -internally against gastrointestinal ulcers and in the form of syrup to soothe a cough.