Land snail

A land snail is any of the numerous species of snail that live on land, unlike sea snails or freshwater snails. These creatures are called "land snails" because they have shells, while shell-less land snails are known as slugs. Some land snails can live in both land and water environments, making it tricky to classify them.

Land snails evolved independently to live on land at least ten different times. Most land snails are called pulmonates, meaning they have a lung and breathe air. Others have gills and a special covering called an operculum. One large group of these snails, the Cyclophoroidea, has over 7,000 species and often lives in damp places like moss.

Land snails have a strong foot that helps them crawl, and they produce mucus to move over rough surfaces and stay moist. They also have a mantle, tentacles on their heads, and a special tongue-like organ called a radula. Many land snails can have both male and female parts and lay eggs in the soil. Baby snails hatch with a small shell that grows as they get bigger.

Land snails are eaten by many animals and are also used as food by people in different parts of the world. In some places, they are even farmed for food.

Biology

Land snails move by gliding on a muscular foot that is covered in mucus. This mucus helps them slide smoothly and also keeps their soft bodies from drying out. As they move, waves of muscle contractions push them forward. Snails are known for moving quite slowly, often at just a millimeter per second.

Most land snails have a hard shell that protects their soft bodies. The shell is made mostly of calcium carbonate and grows as the snail grows. Inside the shell, snails have organs like a lung, heart, kidney, and intestines. Only the head and foot come out of the shell when the snail is active. Some snails can even close their shell with a door-like cover called an operculum.

Land snails come in many sizes. The giant African snail can grow up to 30 cm, while some tiny species are less than a millimeter across. Most have tentacles on their heads with eyes on the upper pair and smell with the lower pair. They eat a variety of foods, from plants to sometimes even other snails, depending on the species.

Human food

Further information: Snails as food

Land snails have been eaten for thousands of years, with evidence found in places like North Africa and the Mediterranean region. They are rich in nutrients, including calcium, vitamin B₁, and amino acids, and they are low in calories and fat. Snail farming, known as heliciculture, has introduced some species to new areas.

In many parts of the world, land snails are a popular food. In West Africa, such as Ghana, snails are a special treat. In Europe, countries like France enjoy eating snails, often called escargots, prepared in their shells with butter. Portugal and Spain also have many tasty ways to cook snails. Snails are enjoyed in many cultures, showing their importance as a food source for many years.

Prevention and control

Main article: Molluscicide

Some substances like Metaldehyde and iron phosphate can help stop snails from causing trouble. Also, copper can be used as a barrier because it gives off electric shocks that snails don’t like, making it hard for them to pass through.