I transfered most of my spiders to new cages last week. Well not new cages but I did replace the substrate and added clay pots and water dishes. My Haplopelma lividum's enclosure was filled up more than halfway with potting soil to encourage burrowing. And sure enough, she's begun to dig a burrow, straight down so far, but she's almost hit the bottom so she might branch off soon. Its funny how she freezes as soon as I turn on the light to check her out. Very shy spider.