Tympanum
A Tympanum is the iguana's Ear. Iguana's have excellent hearing.
An iguana's cage shouldn't be stationed in a "public" place. The activity and noise can stress the iguana. It is best to put an iguana cage where it wouldn't be disturbed. In a bedroom, where there is little noise would be ideal. A cage in the living room where you have a bunch of little kiddies running around and screeching at the top of their lungs (trust me, I know) is not a very good idea. Imagine yourself in a cage with a bunch of noise around you, you can't get away because you are stuck insode that cage, not too easy to relax is it?