I also have a big philisophical difference with "tilers" in that they insist that the australian desert is entirely hard baked clay substrate and therefore tile is the closest approximation to nature. Which is incredibly incorrect. First of all, hard baked clay is nothing like tile which makes me wonder if they have ever been to a hard baked desert in real life. Tile is like rock which would also be fairly natural for them to crawl around on, but not like hard sun baked clay which is still softer than rock, can be scratched around on with sharp claws, and has good deal of dirt/sand/dust around on it. Secondly bearded dragon habitat is actually quite varied- they occur over a wide range and are fairly adaptable. I'm not saying they never occur on hard baked clay but they occur on a lot more substrate than that. Go to google and search for pictures of central australia desert and southern australia desert. Most pics come up with landscapes and substrate very much like central-southern Utah or Nevada during the summer- right down to the brush and everything with soil that is sandy and quite a bit of gravel in places. Dragons also occur in areas with dry grasses and in areas that look very much like a sandbox. Using google you can find photos of wild dragons in very sandy areas. If you go to PBS.org and go to nova and watch the lizard kings (or you can find the link on my blog in the lizard intelligence entry) you can see bearded dragons in the red sands area for just a moment or two out of the entire documentary (which is worth watching anyway even though it focuses on monitor lizards- really cool stuff). These bearded dragons and other lizards in that area are running around on miles and miles of extremely sandy substrate- looks like sandbox sand but red. So loose it is easy to track even small lizards over it because they leave foot and tailprints in a trail when they move about. So loose a monitor can dig in a complete burrow for the night in a few minutes time.