At first they are aquatic. As they mature, they take on a brownish color and emerge from the water slowly and clumsily. Their color matches the color of the stones of the rocky shore, which is its only defense against the preying birds; those who survive, find their way to small pocks and holes in the rocks. There they curl into balls, and develop around themselves a rocklike crust where they entomb themselves. Two months later, their shell becomes rubbery and soft, finally riping open and newborn solastings emerge.