The calcareous carapace protects the animal, and the operculum hermetically seals the carapace; when the tide goes out, they close the carapace. Survives freezing weather during the winter in tide zones of the Arctic Ocean, as well as the daily dry 6-9 hours between high tides during summer. Eggs and nauplii in

the mantle cavity also survive. In very dense colonies, young do not find enough space to grow, so the wall plates become elongate, resembling stalks, elevating the feeding position as in pedunculate barnacles; on rocky coasts, they form a wide band that can stretch for miles. Turbulence and waves are of importance since the current brings plankton for feeding. Fewer individuals settle in areas without strong waves.

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