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The two big cockle shells are actually the halves of one big shell found on Sanibel Island and is about 3-1/2 inches in size. Cockle shells of various sizes and coloring can also be found on Lover's Key, Caya Costa, Estero Island, and Bonita Beach. Caya Costa is an island only accessible by boat and is located between North Captiva Island and Boca Grande.