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The animal on the cover of PC Hardware in a Nutshell, Third Edition, is a scallop. The scallop is part of the pecten family, which includes other bivalve mollusks such as clams and oysters. Also called the fan shell or comb shell, scallops can be found on the sandy bottoms of most oceans, in both deep and shallow water. Scallops do not usually stay attached to rocks. Instead, they either rest on the ocean bottom or swim by rapidly opening and closing their shells. The water ejected by the movement pushes them forward and allows them a freedom of movement unusual in bivalves.