Common Chuckwalla — care sheet

Intermediate. Hardy and long-lived once set up right, but the setup itself is demanding: a big enclosure, a genuinely hot basking spot, strong desert UVB, and a strict plant-based diet. Not hard to keep alive, but easy to keep badly. Best for a keeper ready to build a proper arid habitat rather than a first-ever lizard.

Herbivore. Offer a varied daily salad of dark leafy greens, edible flowers, and desert-appropriate weeds/plants making up the large majority of the diet (roughly 85% greens/plants/flowers), with a small portion of other vegetables and occasional fruit as a treat. Chuckwallas naturally eat creosote flowers, forbs, and grasses; live insects are not needed and, if offered at all, only very rarely.

For one adult, a minimum of 4' L x 2' W x 2' H (48 x 24 x 24 in / 120 gallons), giving at least about 8 sq ft of floor space; bigger is genuinely better for these active baskers. Add roughly a foot to each dimension per additional chuckwalla. Use a front-opening, well-ventilated enclosure.

A hot basking surface of 110-125°F (43-52°C). Provide it with a cluster of overhead halogen flood bulbs over a flat rock or basking platform so the whole animal can warm up, and always measure the surface temperature with a probe or infrared thermometer.

Cool end around 75-88°F (24-31°C) during the day, giving a clear thermal gradient across the enclosure so the lizard can self-regulate.

Safe to drop to room temperature at night; anything above about 65°F (18°C) is fine, and a natural nighttime cool-down is healthy. No night heat is needed in a normal home.

High UVB requirement (Ferguson Zone 4, sun-basker). Wild chuckwallas bask at a UVI of roughly 2.6-3.5, and captive care guides target a basking UVI in the mid-single digits using a high-output desert bulb such as a 22" Arcadia T5 HO Dragon 14% or Zoo Med ReptiSun T5 HO 10.0 running the length of the basking zone. Mount so the basking surface sits about 9-12 in below the lamp if it is over mesh, or 14-16 in if inside the enclosure, and replace T5 bulbs every 12 months.

Low and arid: aim for an average ambient humidity of about 15-30%, and it should generally stay under ~50%. Despite the dry air, provide a single humid hide/burrow they can retreat to, which mimics the cooler, more humid rock crevices they use in the wild.

A naturalistic, diggable desert mix such as washed play sand blended with organic topsoil (or sandy soil), packed at least 3-4 in deep so it holds a burrow. Some keepers use sand/pea-gravel mixes or slate slabs; avoid loose calcium-carbonate "calci-sand," which risks impaction. Include stacked, secured rocks for climbing and wedging.

Dust salads with a plain calcium (no D3) supplement on most meals and a reptile multivitamin about 1-2x per week (juveniles at the higher end). A veggie-based dust such as Repashy SuperVeggie works well on the salad. Proper high UVB plus dietary calcium is what prevents metabolic bone disease.

Around 15-20 inches (38-51 cm) total length, roughly half of that being tail; large adults can approach 2 lb (about 0.9 kg). Males are noticeably bigger and heavier-headed than females.

Commonly 25-30+ years in good captive care; individuals have been recorded living into their late 20s, and some keepers report longer. Plan for a multi-decade commitment.

See a reptile or exotics vet if you notice: Swollen, bumpy, or bendy limbs/jaw, tremors, or trouble climbing (possible metabolic bone disease) - see an exotics vet.; Not eating for an extended period, or steady weight loss despite offered food.; Straining, no droppings, or a visibly bloated belly (possible impaction, especially on loose sand).; Retained shed constricting toes or the tail tip, or discolored/blackening extremities.; Runny or bubbly nose, open-mouth breathing, or wheezing (possible respiratory infection from too much humidity or too little heat).; Any wounds, abscesses, or bite injuries from a cohabitant..