The desert iguana (Dipsosaurus dorsalis) is one of the most common lizards of the Sonoran and Mojave deserts of the southwestern United States and northwestern Mexico. They also occur on several Gulf of California islands.
First described in the Catalog of North American Reptiles, by Spencer Fullerton Baird and Charles Frédéric Girard) in 1853 as Crotaphytus dorsalis it was reclassified two years later as Dipsosaurus dorsalis by Edward Hallowell. The generic name comes from Greek for "thirsty lizard" (Dipsa, "thirst(y)", and sauros, "lizard"). The specific name, dorsalis, is a reference to a row of enlarged keeled scales on the middle of the back which form a crest that extends almost to the tip of the lizard's tail.
The desert iguana is a blunt medium-sized lizard which grows to 16" (40 cm) including the tail. They are pale gray-tan to cream in color with a light brown reticulated pattern on their backs and sides. Down the center of the back is a row of slightly-enlarged, keeled dorsal scales that become slightly larger as you move down the back. The reticulated pattern gives way to brown spots near the back legs, turning into stripes along the tail. The tail is usually around 1 1/2 times longer than the body from snout to vent. The belly is pale. During the breeding season, the sides become pinkish in both sexes.
These lizards can withstand high temperatures and are out and about after other lizards have retreated into their burrows. They burrow extensively, and will often climb into shrubs for shelter and defense. Their burrows are usually constructed in the mounds of sand that accumulate around the bases of bushes like the creosote. They also often use ready-made burrows of kit foxes and Desert tortoises.
Desert iguanas are primarily herbivorous, eating buds, fruits and leaves of many annual and perennial plants. They are especially attracted to the yellow flowers of the creosote bush. They have also been reported to eat insects, feces (mammal and lizard)and carrion.