Crustacea, barnacleaceae. Barnacles are clusters of gray-white animals with calcareous shells attached to rocks by the sea. The food of barnacles includes decaying fragments of organic matter, minute benthos and plankton, including their own larvae, such as diatoms, flagellates, radiolarians and crustaceans. Its shape is a bit like a horse's tooth, so people who live by the sea often call it "horse's tooth". Barnacles can not only be attached to rocks, but also to the hull, and the wind and waves can't wash them away. Every time after peeling, barnacles will secrete a viscous barnacle primary glue, which contains a variety of biochemical components and has strong adhesion, thus ensuring its strong adsorption capacity.
People who often go to the seaside think barnacles are familiar to them. Many people have seen it, but they don't know much about it. Barnacles have hard shells and are often mistaken for shellfish. In fact, barnacles belong to crustaceans in arthropods. Barnacle is a delicious food in Spain and Portugal, which is widely eaten by people and is very expensive. Its taste is salty, usually cooked in a steamer, and then eaten with shells attached to the end of the antenna.