Angelwings - stone destroyers
How often you noticed pebbles with holes inside?
This is work of piddocks also known as angelwings or "pholadidae" .
Piddocks are bivalves, and their specially adapted oval shells have sharp teeth that they use to dig holes in the rock.
Their fleshy foot captures the stone surface and helps to rotate the shell, creating a circular cleansing action. Piddocks will also drill into flooded wood if it is available.
Several other species of mollusc, along with some worms and sponges, can also create holes in solid rock.
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