Sometimes your bunnies will venture outside the burrow just to get some fresh air and play around in the garden, not to mention it gets a little boring being underground all day and night. Bunnies like to know that the sun and moon still exist after being underground for so long.
To keep your bunnies inside the burrow, make sure they have jobs to do, these bunnies are made to work. You can have them mine gems, breed to make new bunnies, or you could just put them on the treadmill or in a bunny wheel to get rid of any ambitions they may have to wander away from their burrow.
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