The Royal Navy frigate HMS Montrose is to get a new electronic 'brain 'which will help her crew defend the ship against air, surface and underwater threats.

For another thing, the experiments suggest aragonite allows the chitons to see equally well in air or underwater, something that's probably useful as tides ebb around the mollusks.

Those that do tend to be insect larvae, which live on land, making their sounds into the air rather than underwater.