They also get dry gangrene on their toes and tails and these parts turn gray or black and become brittle to fall off. The basic cause is poor sanitation. The inflammation, swelling and pus are formed in mouth rot. The blisters cause pus formation. The parasites: The fleas get settled in the gastrointestinal tract of blood in iguanas and these are the main cause of their death when kept in confinement. It depicts their territorial behavior. They fight to show their supremacy on the particular territory. A male iguana will fight with another male he finds in his surroundings. They are very self-esteemed and egoistic. They want to dominate in their particular area and show that they are powerful. They will fight out with other males to mate a female iguana. You can consider some of possibilities for iguana enclosures as discussed below: One of the options is to make a shelter for iguana in a closet. It may though take some time to recycle the closet, but it will make a perfect home for iguana. You can use a secured closet. The size should be big enough for iguana to roam around in it. The disadvantages are that, if the number of reptiles increases more than the owners have space in their homes, it will be a big problem to feed them. It is difficult to manage and control when they already exist in a huge number and will not survive unless they get full care, proper food and shelter. It is possible to install a noiseless small fan to maintain the air flow in the enclosure for iguanas. In addition, you should make arrangement to maintain the temperature and humidity in their cage. The mold should not be allowed to grow. If it grows remove it by washing using bleach and wiping out. Put some treat for them in the water so that they drink water with this food. They will soon get habitual to drink water. 3. Vitamins and minerals: Iguana requires a lot of Vitamin D3, calcium and phosphorous for growth of its bones and body. You should select the food containing these minerals and maintain the ratio of these elements 2:1.