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The drill barnacle is a small, sessile marine pest. These crustaceans have conical or cylindrical shells made primarily from calcium. About the size of a coffee can when full grown, drill barnacles attach to stationary surfaces or large marine animals. If they don't get enough food by filter feeding, they drill in search of blood, and the damage they do to boat hulls makes them, and the obnoxious task of removing them, much hated by mariners. Their range is global, although they are more common the warmer the water gets. Numerous varieties exist, adapted to different conditions, but the practical effects are so consistent that the differences are trivial.
The shells are difficult to remove whole, but can be polished similar to abalone. Most commonly these appear in shades of pearly pink, red, and/or purple (in warmer waters) and purple, blue, and/or green (in cooler waters); a rare albino form is almost white. Just about any color or combination is theoretically possible. The shells are prized for small lamps or jewelry -- by landlubbers. Sailors hate them.
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