Seashells with a round hole in them?
Sometimes on the beach I find clam shells and sometimes snail shells with a perfectly round hole in them, a few millimeters in diameter. It looks like it was made by some kind of animal. A friend said this is from starfishes. Is that correct?
No, starfishes do feed on mollusks, but they do not drill a hole in the shell. They force the shell open. The holes you describe are made by predatory snails. A hole a few mm in diameter is most likely made by a moon snail, a member of the molluscan family Naticidae. A smaller hole might be made by another snail known as the Oyster Drill. Octopus also make a hole in the shell, but it is very tiny and does not have beveled edges like a hole made by a predatory snail. The snails rasp this hole with their radula, a sort of tooth-covered tongue.
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