The Leafless walked in from a walk by the beach to tell us about a log which had washed in. She said it was full of shells. I thought it might be barnacles. I finished my tea and walked out to look at the log.
It was a freshly broken branch of a tree, and it had been colonized by bivalves. Clearly these were not barnacles or limpets. Were they gribbles? I didn’t think they were. They could be piddocks; those are bivalves. But the piddock shells I got to see in a few days did not look like these. I wonder what these mysterious creatures are. Look at the movement of the shells on the extreme left in the 7th second of the video below: they look like real bivalves.
I wonder if anyone can help me figure out what they are.
Don't hold your breath 
They look very similar to something we call, ‘chip-chip’ – Quite possibly they are Coquina Clams.
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Thanks for the suggestion. Do they stick to wood? The few videos I have seen show them as living under the sand at tide lines.
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Great post and lovely photo and video … I’ve no idea what they are but how fun to be near enough to walk that beautiful beach 👌🏼
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Thank you
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