Eastern Collared Lizard

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A startled collared lizard does not just run. It rears up onto its hind legs. It sprints across open rock like a tiny two legged dinosaur, front half held upright.

That sprinting habit makes it easy to recognize. So does the bold black collar across its neck and shoulders. Some regions call it the “mountain boomer.”

It stands out among the wider group of unusual pet lizards. It falls outside the familiar geckos, dragons, and monitors.

The Eastern collared lizard, Crotaphytus collaris, lives on sun baked rock glades. Its range runs from Missouri and Kansas down through Oklahoma and Texas, reaching into the desert Southwest and northern Mexico.

It is not a beginner staple of the reptile hobby. Keepers who can give it real heat, light, and room to run find it rewarding.

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Collared Lizard Care Overview

Collared lizards are desert and glade animals built for heat, open space, and bright light. A keeper needs a hot, dry, rocky setup, not a humid rainforest tank. That means a large enclosure, strong basking heat, full spectrum UVB, and a bone dry substrate.

They are territorial and often solitary in captivity. Two adult males kept together will fight. Even a male and female pairing needs to be watched outside the breeding season.

This is not a lizard that tolerates frequent handling. It is fast, alert, and prone to dropping its tail if grabbed.

Keepers who want a calm, cuddly lizard usually do better with a bearded dragon or leopard gecko. Collared lizard keepers instead tend to enjoy watching a wild, active animal.

Anyone weighing this species against other North American rock dwellers has other options. The horned lizard and the alligator lizard are worth a look too.

Enclosure Size and Setup

Because it is a fast, active runner, a collared lizard needs floor space more than height. A single adult does best with a large floor footprint, on the order of 4 feet long by 2 feet deep. Bigger is always better for an animal built to sprint.

A glass terrarium, a screen and wood enclosure, or a large custom build can all work. Ventilation needs to be good and the space needs to be secure.

Substrate should be dry. A mix of washed play sand, fine soil, and small gravel works well. Pack it and let it dry, and it mimics the hard packed ground of a natural glade and lets the lizard dig shallow burrows.

Avoid loose, dusty sand alone, which can be ingested with food and cause impaction. Avoid anything damp, which fights against the arid setup this species needs.

Furnish the tank with flat rocks, stacked stone, and sturdy branches for basking perches. Arrange them so the lizard can climb close to the heat and light. Leave open floor space for running.

Include at least one hide on the cool end, and ideally a second hide near the basking area. The lizard should never be forced to choose between shelter and warmth. Our enclosure and housing guide covers the general principles behind a rock and heat setup like this one.

Heating and Lighting

In the wild, this species spends its active season on sun exposed rock in open glades. Captive heat and light should be strong to match. A basking surface in the upper 100s Fahrenheit is typical for this kind of heliothermic, full sun lizard.

The cool end should drop substantially. That way the lizard can move along a real thermal gradient rather than sit at one temperature.

Night temperatures can fall well below daytime highs. This echoes the sharp day to night swing of an open rock glade.

A high output UVB bulb, such as an Arcadia ProT5 Kit Desert 12%, is essential. Mount it so the lizard can bask within the manufacturer’s recommended distance. UVB intensity drops off fast with distance and through mesh.

Pair the UVB tube with a basking bulb on a thermostat or dimmer so temperatures stay in range. This species is adapted to strong, unfiltered sun. Keepers commonly run brighter and hotter setups for it than for a shade dwelling species.

Our reptile gear roundup walks through the specific bulbs and thermostats. It covers the monitoring tools that make a setup like this easier to run safely.

Photoperiod should track the seasons. Aim for roughly 12 to 14 hours of light in the warm months, and shorter days in winter. Many keepers allow a cooler, dimmer rest period rather than keeping the animal fully active year round.

A thermometer and hygrometer at both the basking spot and the cool end help. They let a keeper confirm the gradient is real, not just assumed.

What Collared Lizards Eat

In the wild, collared lizards eat mostly grasshoppers, crickets, beetles, and moths, along with spiders. Notably, they also eat other lizards, including smaller individuals of their own species.

Their front teeth are sharp for gripping struggling prey. Their back teeth are flatter, built for crushing hard exoskeletons.

In captivity, the diet is built around gut loaded crickets and roaches. Dust feeders with a calcium supplement most feedings. Add a calcium with vitamin D3, such as Zoo Med Repti Calcium with D3, or a general multivitamin, a couple of times a month.

Offer feeder sizes matched to the lizard’s head width. Feed juveniles daily and adults several times a week. This is an active, high metabolism predator, not a species that thrives on occasional meals.

Wild collared lizards do eat other small lizards. Never house or feed them alongside animals small enough to look like prey.

Fresh water should be available at all times in a shallow dish. The species drinks less obviously than a rainforest lizard, but it still needs it. See our broader lizard feeding guide for more on gut loading and supplement schedules.

Health and Common Problems

Metabolic bone disease is the most common preventable problem in captive collared lizards. It comes from a shortfall of UVB, calcium, or both over time. Signs include a soft or swollen jaw, bowed limbs, tremors, and reluctance to move normally.

Consistent UVB exposure and regular calcium dusting, such as with the Zoo Med Repti Calcium without D3, are the main prevention. Impaction is a real risk with loose, dusty substrates. This is worse if feeders are scattered across sand rather than offered in a dish.

Watch for a lizard that stops eating, strains, or shows a hard, distended belly. Switch to a firmer substrate or bare bottom setup if this happens.

Respiratory infections can follow an enclosure that runs too cool or too damp for this species. Collared lizards are built for dry heat, not humidity.

Signs include open mouth breathing, mucus around the nose or mouth, and lethargy. Any of these are reasons to see a reptile experienced veterinarian, and so is unexplained weight loss or a persistently closed eye.

Our reptile health guide covers these warning signs across pet lizard species in more detail.

Behavior and Temperament

Collared lizards are diurnal, sun loving ambush hunters. In the wild they perch on an exposed rock and watch for movement, then dash after grasshoppers and other prey in short, explosive bursts.

That hunting style carries straight into captivity. A healthy animal stays alert, watchful, and quick to react to motion.

Their signature behavior is bipedal running. When startled or chasing prey, a collared lizard can lift its front half off the ground and sprint on its back legs alone in a short, explosive burst.

It uses its long tail for balance. Only a few lizard groups run this way.

This is a genuinely wild, high energy animal, not a lap pet. Most keepers value it for exactly that reason.

Males are strongly territorial. They display with head bobs and push ups. An open mouthed gape warns off rivals or attracts a mate.

Wild populations are solitary outside the breeding season. Captive males will fight if housed together, sometimes seriously.

Handling should be brief and calm, since this species can drop its tail readily under stress. A dropped tail regrows only partially and never looks quite the same again.

Breeding

Courtship and mating happen in mid spring to early summer in the wild. This is timed to warming weather after a winter cool down period.

Breeders who work with this species typically replicate that cycle. A deliberate winter cooling and shortened photoperiod come first, then a male and female are reintroduced the following spring. A genuine seasonal cue is usually what triggers reproductive behavior.

Clutch size is reported differently across sources. Some give a range as tight as 1 to 8 eggs. Others report as many as 24 eggs in a single clutch, sometimes across two clutches in one season.

Eggs are laid in a dug burrow and incubate for roughly two to three months. One study found that incubation temperature can influence hatchling sex. This should not be treated as a settled fact across the whole species.

Hatchlings receive no parental care and are fully independent from the moment they dig out. Sexual maturity comes early, generally within one to two years. Exact ages differ by source and by growth conditions.

Breeding pairs should always be separated again once mating is done. Females can be harassed by a persistent male, and the two sexes are not natural year round cohabitants.

Lifespan and Size

Adult collared lizards typically measure 8 to 14 inches in total length. A long tail makes up more than half that figure. They weigh roughly 45 to 120 grams, with males running larger and heavier than females.

Hatchlings are only a couple of inches long and grow steadily through their first two years.

Wild lifespan is short for a lizard this size. Field studies put the average around 4 to 5 years, and rarely report individuals past 5 to 7 years. This likely reflects heavy predation pressure from hawks, snakes, and mammals on an exposed, rock dwelling animal.

Captive collared lizards live considerably longer once predation and weather extremes are removed from the picture. Well kept individuals are reported reaching 10 to 15 years.

That wild versus captive gap is worth remembering when planning for the animal’s whole life. A collared lizard bought as a young adult can realistically still be alive a decade later under good husbandry.

Cost of a Collared Lizard

Collared lizards are not bred in the volume that bearded dragons or leopard geckos are. They show up less often at general pet stores. Reptile expos and specialist breeders who focus on North American species carry them more often.

Prices vary by region, subspecies, and whether an animal is captive bred or, less desirably, wild collected. Captive bred stock is the better choice both ethically and, in many states, legally.

Beyond the animal itself, the enclosure and lighting setup is the real cost driver. A large enough tank, a high output UVB fixture, and a basking bulb and thermostat all add cost. Secure rockwork adds more, well beyond a small lizard’s price tag.

UVB tubes also need periodic replacement, since their output fades well before the bulb stops lighting up. Ongoing costs after setup are modest: feeder insects, supplements, and electricity for heat and light.

Always check state and local wildlife regulations before acquiring a collared lizard. Rules on collecting or keeping native reptiles vary.

Our guide to choosing a pet lizard walks through the tradeoffs. It compares an active, high heat native species like this one against calmer tropical alternatives.

Frequently Asked Questions

Can collared lizards be handled?

They tolerate brief, calm handling better as they settle in, but they are fast and easily stressed. Most keepers treat this as a display animal to watch rather than a lizard to carry around.

Do collared lizards need UVB?

Yes. They come from open, sun exposed rock habitat and need strong UVB exposure to process calcium properly. Going without it is a leading cause of metabolic bone disease in captivity.

Can two collared lizards live together?

Generally no. Males are territorial and will fight. Even male and female pairs are usually kept apart outside a deliberate breeding introduction.

Why do collared lizards run on two legs?

Their long hind legs and tail let them lift the front half of the body off the ground. That gives them extra speed. This helps them flee predators or chase fast moving prey like grasshoppers.

Are collared lizards good for beginners?

They are better suited to keepers with some lizard experience. They need strong heat and UVB, plus a large enclosure. They are not a handleable, low key pet the way a leopard gecko can be.

What do collared lizards eat in captivity?

Gut loaded crickets and roaches dusted with calcium form the core of the diet. Offer sizes matched to the lizard, and keep fresh water available at all times.