Crustaceans (Crustacea) are a large suborder of ten-legged arthropods with several families, whose meat we eat and, in some cases, also the roe. This applies, for example, to lobsters, Norway lobsters, crabs, crayfish, and shrimps, which can be divided into five large families, crayfish, true lobsters (Nephropidae, e.g., lobsters and Norway lobsters), crabs (Brachyura, e.g., brown and littoral crabs), true shrimp, Caridea (e.g., rockpool shrimp and deep-water shrimps), and prawn Dendrobranchiata (e.g., tiger prawn). Somewhat confusingly, we call some crustaceans for crabs; for example, the large Kamchatka crab (king crab) is not a crab but belongs to a completely different family of so-called intermediate crayfish (Anomura).