Crabmen make their homes in sea caves and coastal cliffs, venturing forth occasionally in search of food. They spend most of their time hunting, filtering algae for food, or scavenging the shores and beaches. Occasionally, they will gather wet sand from the seashore and filter it through their mouths, sucking out all organic material and plankton. The remainder is a hardened, dry ball of sand approximately 1 inch across; these pellets inadvertently give away the presence of a crabman community.