This large sea snail is found on rocks and amongst seaweeds around the middle to lower parts of the shore. Known as the edible periwinkle, common periwinkle or winkle, it looks pretty similar to a land snail, with a dark brown or grey banded shell and little eye stalks poking out. The edible periwinkle feeds by grazing on algae on the rocks using its rasping tongue, called a radula. They don't like dry areas, so will often be spotted clumped together in a crevice or rockpool at low tide.
How to identify
The edible periwinkle has a rounded, whorled shell, usually greyish-brown in colour. It has concentric ridges, dark lines and a pointed apex. It is distinguished from similar, snail-like periwinkles and topshells by the slightly larger size, rounded shape and generally plainer colours.
Did you know?
Winkles are often boiled and sold as a snack at the seaside. Using a pin to pull them out of their shells, they are eaten with vinegar and white pepper.
How people can help
When rockpooling, be careful to leave everything as you found it - replace any rocks you turn over, put back any crabs or fish and ensure not to scrape anything off its rocky home.
