They whip it in the air especially when a predator corners them. Their tails are likewise used for swimming. The dewlap is a huge flap of skin that is contained on the sides of the body particularly in the areas of the throat of a male iguana is used to either intimidate a predator around or to impress another female iguana.
The dewlap also functions in the regulation of their body temperature. Furthermore, the iguanas also contain some crest of very soft spines that lineup the middle part of their backs and necks. Relatively, the male iguanas have longer spines in contrast with the female iguanas.
By means of size, the male iguanas appear to be bigger. They have bigger heads and brighter body colors compared with the females. The body of the male iguana is much distinct during the time of the breeding season. Physically, both the male and the female iguanas contain twelve up to thirteen pores underneath the sides of their thighs.
The pores are the ones which secrete the waxy substance which they use in marking their territories and identifying each of them. When the male iguanas mature, their own femoral pores come to develop some outward projections which they tend to use in the copulation strategy to take a grasp of the female iguana.