It will have a darkest color in the morning when it is cold and gradually it turns its color to whitish in the afternoon to avoid feeling very hot. The scientific name for the desert iguana is dispsosaurus dorsalis. It is most commonly found in Mojave deserts of South Eastern California, Southwest Utah, Sonoran deserts, Southern Nevada, California, Baja, Northeast Mexico ,South Central Arizona, and gulf of California Islands. The best time to give them food is at the daybreak almost an hour after they wake up. It is the ideal time for their food as they can digest the food during the day before going to sleep. Moreover, the morning atmosphere provides perfect temperature for digestion of food. You can feed them all through the day also, but take care to feed in small quantities. The female red iguanas lay eggs in burrows dug by them in hot sunny areas. They cover their eggs and leave them unguarded. The eggs get hatched themselves because of warmth of steady temperature between 77 and 89 degrees Fahrenheit. All eggs get hatched simultaneously. Young iguanas come out of the tunnel themselves. The closet is a better alternative in that respect to provide the heated place with a controlled temperature. But there are some disadvantages with using a closet. It has a confined space and it is difficult to clean it. At the same time, you have to provide water in it and it may not be closer to a sink or bathroom. Species such as the red iguana and also green iguana exist in huge numbers, but there are a few species similar to Fiji Island iguana as well as Brachylophus vitiensis, which are turning out to be in endangered category. However, many times, it is hard to distinguish iguanas. Most of the species act different and appear distinct. As they grow, you need to provide them larger shelter. The cage should have a good height so that the iguanas can jump around. The bottom layer in the cage is also import thing. It can be made from indoor or outdoor carpeting, orchid bark, newspaper or from artificial turf. You should not use any wood chips or barks as they can attract pest or termite.