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 I was watering my grass and saw tons of pill bugs streaming out of the grass. I touched one and he(or she) curled up into a ball. I wondered how he did it so I took him and took a piece off his abs and looked at it under the microscope. I saw that there were millions of little cells all  wound  together in a tight bundle. There were tendons all around so that they can contract on command.
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How pill bugs do a sit-up

How pill bugs do a sit-up

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