It is an edible marine bivalve mollusc while many small edible bivalves are called cockles, true cockles are species in the Cortidae family that live on sandy, sheltered beaches around the world.
Weeds are very numerous (about 125); and some, notably the sand-bur (Solanum rostratum) cockle-bur, and tumble-weeds among indigenous, and the Russian thistle (Salsola tragus) and purslane among non-indigenous species, are agricultural pests.
The cockle is liable to the same suspicion as the oyster of conveying the contamination of typhoid fever where the shores are polluted, but as it is boiled before being eaten it is probably less dangerous.
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