To many people, the incredibly light, white cuttlefish is familiar from being sold in pet shops as a calcium source for pet birds like budgerigars. It is actually the internal shell of the cuttlefish, which is a relative of the octopus. Although it lives in the sea and despite its name, the cuttlefish is not a fish- it is a mollusc (like snails), hence the form of 'shell' that is left behind when it dies.

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