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Look for a clean jar or empty shoe box to house your woodlice. To keep just a few woodlice, use a small jar. For lots of woodlice, consider purchasing a container, such as a plastic terrarium or glass aquarium from your local pet store. Keep in mind that if you pick a shoe box or small cardboard box, you won't be able to keep the woodlice for more than a day. This is because the moist material and environment will make the container break down quickly. Spread the soil in the container so the bottom is completely covered. Press down a little so the soil is firm enough to support the woodlice and their digging. Add as many woodlice to the container as you like. If you're digging into the soil with a sharp shovel, use caution so you don't accidentally injure woodlice that may be in the ground. Scatter about 1 inch (2.5 cm) of leaves across the soil in the container. It's fine to place these over the woodlice since they prefer to be under leaves and soil. You can also add small sticks or twigs and scraps of bark. Your woodlice will eat the leaves and climb around the sticks. Leave rocks out of the container since they can tumble and crush the woodlice, especially if the container is moved. If the container has a lid, close it and ensure that air vents are open. To make your own air vents in a shoe box, put the lid on the box and carefully poke holes in the top. If you're using a jar, cover the jar with waxed paper, plastic wrap, or foil. Then use a sharp skewer to poke holes across the top.  Use caution or ask for help when poking holes in the lid. Ensure that the holes aren't big enough that the woodlice can escape. Put it out of direct sunlight so the woodlice don't overheat. Since woodlice prefer a cool environment, you don't need to use any special heat lamps, just keep the container inside your house. If you have other pets or small children, put the woodlice container somewhere out of their reach.

Summary:
Choose a sturdy container to hold the woodlice. Put 2 inches (5.1 cm) of soil in the container and add the woodlice. Add leaves, sticks, and bark to give the woodlice something to explore. Cover the container and poke air holes across the top. Place the woodlice container in a secure spot in your house.