This is just something I've been curious about from reading through the site for a while. I've seen enclosures that create an almost perfectly natural environment for snakes, lizards, amphibians, etc. but have yet to see any small mammals in these naturalistic cages. I'm not talking about setting up a dog in a "wooded kennel" - but would there be any reason against setting up an enclosure for something like a hedgehog or short-tailed opossum that had a more naturalistic feel to it? I understand it'd be more difficult to clean/maintain, but would there be any health detrimant to the animal being housed?