Littorina littorea, better known as winkle, is a marine molluscan gastropos species of the genus Littorina. The winkle has a soft body and a spiral, conical, pointed shell. The winkle is easily recognised thanks to its smooth, black and regularly rolled shell. It is a herbivorous grazer, which feeds on green algae and diatoms. It moves by crawling on its feet.
There are many species of winkles (belonging to the family of marine gastropods), but the one that is consumed is the common grey winkle measuring from 1 to 2 cm.