Cockles are sometimes called blood clams because the liquid that the raw (or lightly blanched) bivalves release when opened is dark red. They look similar to clams, except that cockle shells have ...

When buying live molluscs, look for those with shells that are smooth and shiny. The shells of clams, cockles, mussels and oysters should be tightly shut or should shut immediately if you tap them ...

These included brachiopods, which lived in shells resembling those of clams or cockles, and animals with jointed, external skeletons known as arthropods—the ancestors of insects, spiders ...