Basin wiki · Animals
Desert iguana
Dipsosaurus dorsalis
A pale, heat-tolerant lizard of sandy creosote and washes. More at home on the hotter side of the basin than in a shady Yucca Valley yard.
Where you'll see it
Desert iguanas prefer open sandy or gravelly flats, washes, and creosote with loose soil they can burrow in. That is more Wonder Valley, the eastern park, and the Colorado Desert side than the higher, rockier, cooler benches of Yucca Valley and Pioneertown. They are famous for staying active in heat that sends other lizards underground, so a pale lizard out at noon in July on a wash bank is a clue. This entry stays at medium confidence on how common they are yard-by-yard in the western basin, because that shifts with elevation and soil.
How to tell it
The body is pale gray to cream with a row of brown spots or faint bars, the head is blunt, and the tail is long and ringed. Adults are medium-sized, bigger than the side-blotched lizards under every shrub and smaller than a chuckwalla. Chuckwallas are the rock specialists and look heavier and darker. A desert iguana on pavement will often run for a burrow at the base of a creosote rather than for a boulder crack.
Food and heat
They eat flowers, leaves, and some insects, with a strong plant bias when spring annuals are up. The park’s reptile overview notes that many desert lizards can meet their water needs from food. A water dish in the sun is more likely to attract bees and coyotes than to be this animal’s plan. If you are planting for them, the native annuals that come up after rain matter more than a sprinkler.
Leave it, and watch the dog
They are native reptiles, not collectible pets, and park rules forbid taking them. Dogs learn to grab them; a lizard that drops its tail has spent a stored resource it needed. Burrows at the edge of a pad get collapsed by people “leveling” with a tractor. If iguanas are using the wash behind the house, the useful help is to keep vehicles out of that wash and skip the broadcast insecticide.