Snail

Not insects, but here

Snails are gastropods (Gastropoda) — soft-bodied mollusks with hard external shells. They’re not insects or arthropods. They’re included in this insects collection only because they’re commonly grouped with garden invertebrates in everyday usage and popular alphabet challenges.

The class includes terrestrial snails, freshwater snails, marine snails (whelks, conches, periwinkles), and slugs (snails that have lost or reduced shells).

Single-footed locomotion

Snails move on a single muscular foot that produces wave-like contractions, gliding the snail forward on a layer of secreted mucus. The mucus serves multiple functions:

• Reduces friction with the surface
• Protects the foot from sharp surfaces
• Allows climbing on vertical and even inverted surfaces
• Some snails can crawl on the edge of a razor blade without injury

A snail moves at roughly 1 mm per second at peak speed. The English word “snail’s pace” understates them — they’re remarkably efficient for their slowness.

Garden pest, agricultural problem

Many terrestrial snails are major garden pests, especially:

• Brown garden snail (Cornu aspersum) — Mediterranean origin, now worldwide.
• Banana slug (Ariolimax) — Pacific Northwest, large.
• Giant African land snail (Lissachatina fulica) — invasive, transports parasites.

Damage includes eating young seedlings, damaging fruits, and spreading plant diseases.

Edible

In French cuisine, escargot (cooked land snails) is a traditional appetizer — typically the European Roman snail (Helix pomatum) or brown garden snail, prepared in garlic-parsley butter.

Italian lumache and Spanish caracoles are similar traditions. Greek and Cypriot chochlioi are seasonal specialties. Across these cuisines, snails are usually purged (made to fast or eat clean food) for several days before cooking.

Hermaphrodite reproduction

Most terrestrial snails are simultaneous hermaphrodites — each individual has both male and female reproductive organs. When two snails meet, they can fertilize each other simultaneously. The mating ritual involves complex pre-copulation behaviors, sometimes lasting hours, and includes the famous “love darts” — calcium-carbonate spikes some species inject into mates as part of the ritual.