They look pretty much like oysters in most ways bar the cap, which is a bit unruly in shape. Probably just means means they’re old, though.
Yeah, some big ones that look old. Here is a smaller one that looks younger/fresher.
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Very oystery, looks like you’ve found some. They regrow in the same spot so will be there year on year too.
@Arducius started
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They look pretty much like oysters in most ways bar the cap, which is a bit unruly in shape. Probably just means means they’re old, though.