Ahhh Pittsburgh Zoo...home to a few crappy exhibits. Why do you tempt me into commenting by building such an inadequate "cave"? Is there more than meets the eye to this terrarium or is it really just another zoological travesty?
@snowleopard - I think you're rather moving more towards hyperbole territory now. (Although I agree it could indeed make a good enclosure for a colony of invertebrates like cockroaches because they could utilise the entire surface area).