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The giant cockle sea shell commonly found along Southwest Florida beaches but normally not alive like this one. The shell can reach up to 4-5 inches across. The shell is Heart-shaped/ovate, with 30-40 rounded radial ribs on each valve.  The shell is a creamy white/tan exterior with reddish-brown mottling…the interior is often pinkish. They live in shallow sandy substrates in the Gulf of Mexico. Found along SWFL shores. Like other cockles, it uses a muscular “foot” to burrow and to leap away f