Desert Iguana

Presentation

The desert iguana is a medium-sized lizard native to the arid zones of southwestern North America. Its pale coat, ranging from beige to grayish, is marked with a line of brownish spots along the back, which helps it blend in with sand and rocks. It has a low-profile dorsal crest made up of small spiny scales. Well-adapted to extreme heat, it ranks among the most thermotolerant reptiles known. Active during the day, it alternates between basking in the sun and retreating into burrows to regulate its body temperature.

The body is stocky, with a tail longer than half its total length. The skin has smooth scales on the flanks and slightly keeled scales on the back. Colors can lighten or darken depending on ambient temperature, a thermoregulatory mechanism.

Characteristics

Indicative values: they vary by subspecies, sex and region.

Habitat and distribution

The species inhabits hot, arid deserts, particularly sandy and rocky expanses dotted with sparse shrubs. It seeks areas offering both direct sunlight and underground shelters or rock crevices.

Behaviour

Diurnal and territorial, the male defends its territory through intimidation displays and head-bobbing. The desert iguana digs or occupies burrows that it uses to escape extreme heat and predators. It tolerates high body temperatures, exceeding those that most other reptiles can endure.

Reproduction

Reproduction occurs in spring, following a mating period characterized by male courtship displays. The female lays three to eight eggs in a burrow dug into the sand, where incubation lasts approximately two months. Young are independent from the moment of hatching, with no parental care.

Peculiarities

This species tolerates body temperatures approaching 45°C, an exceptional level among reptiles. It is capable of closing its nostrils to limit water loss and possesses movable eyelids that protect it from sand.

Threats and conservation

The destruction of desert habitat through urbanization and motorized recreational activities constitutes the primary threat. Collection for the pet trade affects certain populations locally. Overall, the species remains widely distributed.

References

Profile updated 09 September 2026 · Reviewed by the TunisieVet editorial team.