Lettered Olives, Oliva sayana, feed on marine worms, crustaceans, and small bivalves, among other prey items, but on occasion can be scavengers, feeding on the carcasses of dead fish, crabs, and other mollusks. They are fast-moving mollusks, as suggested by the little “bow waves” generated by the snail in the photo, as it moves through one-half-inch-deep water on Bunche Beach, Fort Myers, Florida (at low tide).
