Because I have this mother gravid and build a hide out of cardboard and she enjoy it with a perfect coil in there. It seems to reduce the stress while she is waiting to blow. One day I open up the hide and is like *surprise* !! Well, card board is not really a good idea, once they pees, it is gone.
All my other * not so big * snakes are hide on ice cream tubs and vase bring cut into 2. Just this big mama, cant find anything to fit her.