By flattening their bodies again the lava rocks, the lizards expose as much skin surface as possible to the sun. The flow of heat is regulated by vessels in the chest which close and open to regulate body temperature. Martin Wikelski Females reach sexual maturity when 3 to 5 years old. Breeding season begins in December and extends through March. During mating season the male iguana will turn very vibrant colors.
Females mate once per season.
A courting male will approach a female with his head down. As he moves forward he will nod his head rapidly. As he continues to approach he will circle the female or move up sideways into contact with her, moving his head along her tail. Then he will through his front leg over the female, moving onto her back. From this position, he will attempt to bit the skin of the neck or shoulder.