Iguanas

It's very rare for Iguanas to hibernate however there are some cicumstances when they do. Each species has what is known as a preferred optimum temperature range or POTR. This temperature range is when the iguana’s body’s organ system works the most efficiently. Temperatures that are significantly above or below the desirable range can preclude the iguana to environmental and metabolic stress and as a result can end in death if the problem is not corrected.

Species like the iguana deal with abnormally high or low environmental temperatures in their natural environment by altering their habits. Diurnal animals have been known to rest during the day and only come out at dawn or evening. Crepuscular animals may come out a bit earlier or later. Some animals may even attempt to burrow underground or in under substances where the temperature and humidity are less affected by the ambient surface and air temperatures. Many species will take part in a partial hibernation in which the animal in question will sleep for the duration of the extremely hot, cold, wet, or dry whether helping to conserve energy resources and body fluids until the weather becomes more tolerable.