What Eats Barnacles?

Answer

Barnacles have several natural predators. Sea stars, worms, snails, sheepheads, whelks, and several other marine animals are known to eat barnacles. You can find more information here: http://library.thinkquest.org/J001418/barnacles.html
1 Additional Answer
With their hard exterior, barnacles are safe from most predators, but some whelks can drill through a barnacle's hard exterior to eat the flesh within. You can find more information here: http://www.reef.edu.au/asp_pages/secb.asp?FormNo=40
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