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How to create an indoor box turtle habitat
Set up a large enough enclosure.
Box turtles need a lot of room to roam like in the wild. Each turtle in your terrarium needs at least three square feet (91 cm) of floor space for every eight inches (20 cm) of their length.
This provides them enough room to roam, dig, and explore. For example, a 12 inch (30 cm) turtle needs at least a 4.5 sq ft (137 cm) of space.