Recreational habitat
A successful reptile terrarium simulates the natural habitat of the reptiles inside as closely as possible. Cold blooded creatures that they are, reptiles require external heat sources to warm their bodies in order to carry out essential life processes. Because structures shelter us from the heat of the sun, reptile terrariums require artificial heat sources.
More than night and day
Diurnal animals require more than simple light and dark. Their bodies produce essential vitamin D when exposed to the sun's natural UV rays; without vitamin D, animals (including humans) cannot absorb calcium and phosphorus. Prolonged deficiencies of these minerals lead to painful cases of rickets and osteomalacia a softening of the bones.
Some fluorescent bulbs emit UV rays and will fill your reptile terrarium with the necessary UV light that incandescent bulbs lack.
Reptilian roommates
If you're wondering how to populate your reptile terrarium, here is a list of popular choices:
Open door policy
A reptile terrarium should be an open terrarium. Closed terrariums may not provide adequate oxygen to sustain creatures as large as reptiles, so it's likely you will need to provide food and water. If possible, access your reptile terrarium through a front port: a sliding door or removable panel. Accessing a reptile terrarium through the top may be perceived as the arrival of a predator, which can cause your reptile to suffer unnecessary stress.