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...and I touched the third one to make it withdraw so that I could safely excavate a little. I didn't know what they were, in fact. Now, I couldn't get the sand out of the way well enough for a decent picture, but there's the top of the shell protruding from rock. I was gentle with it because I know the shells of dead ones, at least, aren't very strong, but I got the impression that it had pulled the shell down into its rock so that no predator could pry it open without destroying the shell. How terribly clever!
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