Iguanas tend to become darker if they are cold. ... Color change in response to temperature is called "physiological thermoregulation." In addition to the darker color, an iguana may develop dark, wavy lines on its head or body if it becomes chilled. Iguanas kept in too warm of an environment may become lighter in color.

Do iguanas change color to camouflage?

Young iguanas are green because they hide high up in the trees on thin branches between the foliage. As they get older they move to thicker branches that has less foliage and for this reason their colour changes from bright green to grayish - brown etc. This change in body colour is to camouflage them from predators.

Can iguana change its Colour?

Iguanas do not change colors as intensively as chameleons, but depending on the environment, mood, time of the year and health, iguana can change colors. Also, green iguanas tend to get darker with age, while red, blue and yellow green iguana morphs get their vivid coloring more prominent with age.