Fogging will still occur even if the camera is at a room temperature, but it will be less intense and should cease in about 20 minutes. Happily, all my equipment has survived aviary conditions many times without gathering condensation inside. It's nice to have an option of using a tripod, but I seldom carry one into an aviary. Unfortunately, this is a heavy setup, and my hands quickly lose the steadiness necessary to keep the subject in a very limited depth of field. I have better results with a single strong unit equipped with the LumiQuest bouncer.
Black backgrounds look good with moths but appear artificial for butterflies.
To avoid them, whenever possible I meter the background and choose an exposure one to two stops under my reading. This technique frequently requires an f-stop close to f5.6 and a very limited depth of field. Under these conditions, getting the whole winger in focus is the main challenge. In an indoor aviary there are so many butterflies, you may choose a flower, sculptured angel, or other background feature and wait for a subject to land there in front of your lens. Others will generously permit you to chase them for a while.