Common periwinkle

The edible periwinkle is a small sea snail that lives along rocky coastlines. It's a type of marine mollusk with a coiled shell and a little trapdoor called an operculum to seal itself inside. People have collected these snails for food for centuries.

• Breathes underwater using gills like a fish.
• Seals its shell with a hard plate when hiding from predators.
• Belongs to the periwinkle family of sea snails.