Normally, these are not black. 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 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. But, they have found the advantage of it and are really making money from iguana nests. They are breeding the iguanas and at the same time selling their babies. The iguanas can be purchased cheaply these days. This really makes one to think that pet iguanas are really disposable so easily. There are advantages and disadvantages of keeping iguana nests and also breeding these reptiles. Males are mostly aggressive to the rest of male species in their territory. They signal to each other by bobbling their heads and keep in touch. Breeding: Their breeding season comes in spring season, the night before it starts raining late in the month of May. The females dig the tunnels for laying eggs. Generally, they exist in abundance in the deserts and rainforest regions. They have a variety of species. The iguanas mostly live on the nature and can adjust easily with their surroundings. Some species are living in deserts while others live in rainforest. Even a few species have their dwelling in sea. You Can Have a Special Pet: Giant Green Iguana Several people are keeping Giant iguana as their pet in place of dogs and cats these day. It is called "giant" for its size when it becomes adult. You may wonder about the size of this reptile when it grows up, all the accessories which you buy for your cute pet may become un-usable for their size after some time.