Answer: Are you familiar with "Roly Poly" or "Pill" bugs? Do they roll up into little balls if you try to touch them? It's funny, if you've seen the movie "A Bug's Life" there were two of them in that movie, appropriately enough, named "Tuck" and "Roll". If that is what you have, and it sounds like it from the description, they are pretty much harmless. They feed mainly on decomposing matter, kind of like little composters.
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