As the iguana grows, you should be able to make changes in the size of its cage rather than shifting it from one cage to another. It is advisable to go for a bigger cage from the beginning. That will provide more freedom to iguana for moving around. Food: Now coming to the food to be given to your pet iguana, naturally it should be given a healthy food. For instance, the marine iguana can easily swim and green iguana can climb the high treetops. The others iguanas also develop the skills required to live in deserts and dry places. Iguana living in the forests and deserts are herbivores and eat leaves, vegetables, flowers and fruits. The other varieties eat juicy mealworms and wax worms. At the same time they are timid also and will run away out of fear. Female iguanas lay the eggs by digging tunnels. They do not hatch their eggs. The eggs get hatched themselves in warmth. All eggs get hatched simultaneously. Iguanas are eaten by human beings and many of their enemies. Several measures are required to save iguana from extinction by educating people who live in iguana inhabited areas, by their captive multiplication in zoos and imposing restriction on their hunting You need to ascertain that the temperature is maintained at 70 degree Fahrenheit in day and 85 degrees during night. If you can place their cage nearer to some source of heat, that may be a wonderful thing. Baby iguana will be interested to get comfort and rest by staying nearer to the source of heat radiations. Viral Infection: Many death of iguana occur due to the viral infection in iguana. The research is still on to find the causes and treatments for this virus. Organ failure: The natural aging process results the failure of organs. In some cases, there is bacterial infection that causes the failure. The predominant signs are loss of weight and appetite, bloating and even death. Their young ones have a biaxial stripe and the fully grown marine iguanas have grayish color. They actually have a dull color. They have the advantage to absorb heat from sunrays when they come out of water because of this dark color and can keep themselves warm. They mostly eat marine algae. The excess salts are released by their body through their nasal glands when they go for sunbath.