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This japanese pipe shellfish is moving up a old concrete wall.
I push it with my forefinger. The shellfish pulls their head into the shell and stop moving. When the work of this day is off, it rests still there.
Next day, I can't find it there.
These land shellfish eats a concrete thing to get calcium for their shell.
(@東が丘 Higasigaoka, Meguro ward)