SO... i put a box in my rats (Mochi) cage. and well she ATE it. not chew up ate it there is no shavings anywhere i have her on fabric not bedding from pet store and the box was not big it was size of finger tip box and its gone why would she eat that. SO i rip a thin peas of card bored from cereal box and put it in her cage she runs over and "nom nom nom swallow " O MY GOD NOOOO! she was eating it all. strange addiction rat addition! ???