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The images on the cover of WebLogic: The Definitive Guide are sand stars. The sand star is a starfish whose main defining feature is the spines that cover the sides of its legs, which differ from the suction cups that most starfish have. The sand star uses these spines to travel. It is chiefly nocturnal and tends to bury itself in sand in daylight hours. Its spines are helpful for allowing it to burrow into and move quickly throughout this sandy environment. The sand star swallows its food whole. Its diet consists of snails, sea urchins, seaweed, other starfish and sand stars, and any dead fish it can find. It often feeds off other creatures it finds buried in the sand alongside it.