There is a lot of info out there regarding their care, however, in a nutshell, here is how we keep our rhinos (realizing, though, that there are a lot of blanks to fill in between the lines):
Cage: We keep our trio in a custom made habitat systems cage that measures 12' wide x 4' deep x 5' high complete with natural rockwork basking ledges, fake trees including a long horizontal above ground fake palm tree for additional basking/climbing areas, large boulder for another basking spot (this allows each lizard to have its own basking area). Substrate consists of a combination of pea gravel, torpedo sand, dirt/moss mix, and ESU jungle litter mix....great combination that looks real nice too. For lighting we use Power Sun bulbs which provide both bright light basking spots and important UV rays. Additionally, we have several banks of 48" uv bulbs. A misting system is incorporated to keep the animals hydrated while also boosting ambient humidity levels. We also provide a large, shallow water pan which the iguanas love to soak in.
At night, when the power sun bulbs go off, a large pro product radiant heat panel turns on which is connected to a thermostat (to provide the optimal night temps).
Diet consists of Marion Reptile and Leafeater Diet, various dark leafy greens including mustard, endive, romaine, bok choy and lots of other stuff, various mixed veggies, a little fruit, and a little protein in the form of small quail, mice and super worms (animals are a small percentage of their diet but we feel it is an important component). We also provide a quality vitamin/mineral supplement.
The dimensions of the cage we described is the bare minimum and we are already planning on building a much larger exhibit in the near future....just something to keep in mind.
Hope this helps. Rob
Rob Carmichael, Curator
The Wildlife Discovery Center at Elawa Farm
City of Lake Forest Parks & Recreation (IL)