They may like to climb up the branches or hang over them. If the iguana is small, make a proper cage without any holes in, so that they cannot escape out of it. When the iguana grows up, shift them to a larger place or expand the area of their dwelling. It should not be a congested place for them. 2. 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. In case you want to keep iguanas as pet, you should note a few important points as dos and don'ts with them. The enclosure of your pet iguana should be cleaned regularly. It should be big enough to accommodate the pets for moving freely and feel comfortable in it. There should be sufficient lighting. The iguanas normally eat plants, vegetables and fruits. They should not be fed food containing animal protein. They may relish pizza and all junk food, but that is not good for their health. Give them a limited quantity of vegetables. Do not feed them on spinach. They require diet containing rich quantity of Vitamin D3, calcium and phosphorous. When it is the reproduction time, the adult males get a teal green or reddish color. The iguanas in the Santa Cruz appear black and brick red. The iguanas flourishing in Fernandina become brick red and dull green. The sizes of marine iguanas also vary from one island to another. In Isabella and Fernandina, you can get the biggest marine iguanas of complete Galapagos Islands. Their tail constitutes almost half of their total length. In spite of being green they have a dominant black stripe on the body. They have monochromatic green color. Their green shade is different from bright green or grayish and dull green. Their skin is rough like rasps and they have pointed scurfs on their back.