Heart cockles (Corculum cardissa) are bivalve molluscs a bit like clams ... calcium carbonate crystal structures in the heart cockle shells that function like fibre-optic bundles, letting light ...

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 ...

a type of bivalve mollusk. Compared to its clam cousins, the heart cockle doesn’t need to open wide to bask in the sun. It has a clever trick up its shell: tiny, “transparent windows.” ...