For one male, you can keep one or more females. It is better to maintain the number of male iguanas smaller than females; otherwise males may be killed fighting with each other during mating. The nest can be created with some media like using 100% potting soil and the eggs can be buried under it. The other option is using equal quantity of sand and potting soil. They should be given fruits, vegetables, flowers insects and worms, etc., whatever they otherwise eat when they are wild. Apart from the proper food, they should be kept in proper clean and illuminated place where they can get sunlight. Sunrays provide them calcium needed for their proper digestion of food. To make the iguana get sufficient quantity of the vitamins and mineral, they should be able to get exposure to sunlight to maximum possible extent. 5. Temperature: Iguanas are cold blooded animals. Their body functioning mostly depends upon the heat they absorb from their environment. For the digestion of the food, they require heat from atmosphere. Maintain the temperature in cage during the night and use heating pads to heat up the enclosure. It is also feasible to use low wattage lamps for getting heat. 4. Iguana will not get settled in their new dwelling easily. It has to get accustomed to the shelter. Initially it may be shocked and start scratching or scraping the walls. Here are some critical characteristics about this species. Physical characteristics of Rhinoceros Iguana: This is a very strong type of lizard. It has a firm body, which has a strong crest of its spine and is completely sturdy. It possesses long legs and walks tall on the ground. The Rhinoceros Iguanas have mostly grayish brown color. You may be aware that iguanas are herbivores and they mostly eat flowers, buds, tender leaves and fruits. In addition, they also feed on some worms like: rare juicy mealworm, cricket, and wax worm. Iguanas also eat a few different varieties of dark leafy greens and fruits in some parts of America. A few types of iguanas grow very fast.