Alligator Lizard Care: What They Need and Why to Leave Them Wild

Alligator lizard care starts with a question most care sheets skip. Should this animal be in a cage at all? Alligator lizards, genus Elgaria and Gerrhonotus, are native wild reptiles across the western United States and northern Mexico.

They are not bred in the pet trade in any real numbers. Almost every alligator lizard offered as a pet was pulled from a yard, a woodpile, or a hillside. Before setup, temperature, or diet, alligator lizard care has to start with the law and the welfare question.

This guide covers both sides. It lays out the law and welfare questions first, then a full alligator lizard care sheet for anyone who already has a legally acquired animal. For the species overview and identification, see the alligator lizard page.

Is it legal to keep a wild alligator lizard?

Alligator lizards are native wildlife, and native wildlife is regulated at the state level. Rules vary widely from state to state. Some states let a resident collect a few common native reptiles for personal keeping under a hunting or fishing license and a bag limit.

Other states protect all native herptiles. Those states require a scientific collecting permit for any removal from the wild, with real fines for violations. California, home to the southern alligator lizard, requires a Native Reptile Captive Propagation Permit to sell, transport, import, export or propagate native reptiles commercially.

A separate permit covers noncommercial propagation. Both come from the California Department of Fish and Wildlife.

Because the rules differ by state and change over time, the only reliable answer is to check directly with your state wildlife agency. Do this before collecting, buying, or keeping a wild alligator lizard. Do not rely on a forum post, a pet store clerk, or any care sheet for the legal answer in your state.

Never treat a permit requirement as optional. Never look for ways around it. A lizard taken or kept in violation of state law can be confiscated, and the keeper can be fined.

Setting the law aside, there is a welfare argument for leaving wild alligator lizards wild. They are not selectively bred for captive life the way corn snakes or leopard geckos are. Wild caught individuals tend to be higher strung and more prone to biting and musking under handling.

They are also more likely to carry a heavy parasite load. That load usually needs veterinary treatment before the animal is stable in captivity. A wild population also loses a working adult, and possibly a breeding female, every time one is removed.

If you find an alligator lizard in your yard, the best outcome is almost always to leave it exactly where it is. It is already doing pest control work for free, and it belongs to a wild population that does better with it left in place.

Alligator lizard species at a glance

Several distinct species share the alligator lizard name. They differ enough in size and range that a single care sheet does not fit all of them equally. The table below summarizes the four species most likely to turn up in the United States.

The southern species figures come from the San Diego Zoo library fact sheet and the California Department of Fish and Wildlife life history account. The northern species figures come from the Washington Department of Fish and Wildlife.

Size, native climate, and enclosure needs all scale with the species. Identify which one you actually have before sizing a cage. For a full breakdown of adult sizing and growth, see the alligator lizard size page.

Enclosure size and setup

A single adult southern, northern, or Madrean alligator lizard needs a floor footprint of about 20 to 30 gallons, roughly 30 by 12 inches. A Texas alligator lizard is larger and more active. It does better in 40 gallons or more, closer to 36 by 18 inches of floor space.

Height matters less than floor space for this genus. Alligator lizards are ground dwellers and semi fossorial burrowers, not climbers. A low branch or cork round still gives useful cover and a basking perch.

Substrate should hold some moisture without staying soggy. A mix of coconut coir, organic topsoil, and leaf litter, four to six inches deep, lets the lizard burrow. It also supports the humidity gradient described below.

Provide at least two to three hides. Put one on the warm end and one on the cool end.

The lizard can then thermoregulate without choosing between shelter and temperature. A shallow water dish large enough to soak in, changed daily, rounds out the basic setup.

For general enclosure sizing principles across lizard species, see the lizard enclosure guide.

Alligator lizard temperature

Alligator lizard temperature needs reflect their temperate, often coastal or montane origin. They run cooler than desert species like bearded dragons.

The California Department of Fish and Wildlife notes the southern species is active at cooler temperatures than most lizards. Field body temperatures run as low as 52 degrees Fahrenheit (11 degrees Celsius).

The enclosure figures below are the common keeper standard for the genus. No zoo or veterinary source publishes captive temperatures for it.

They fit the Merck Veterinary Manual rule of a basking zone about 9 degrees above ambient air. A basking spot of 82 to 88 degrees Fahrenheit, measured at the surface, lets the lizard warm up without overheating.

The cool end should sit in the mid 60s to low 70s Fahrenheit. Nighttime temperatures can drop into the upper 50s to low 60s without harm. Alligator lizards experience cool nights across most of their native range.

A digital thermometer with a probe at both the basking spot and the cool end is the only reliable way to check these numbers. Infrared readings and simple dial gauges are frequently inaccurate. If the basking spot will not stay below 90 degrees Fahrenheit, the enclosure is too small or the fixture too strong.

Alligator lizard humidity

Alligator lizard humidity should run higher than a typical desert terrarium, generally 40 to 60 percent ambient. The state life history account records relatively high evaporative water loss at normal active body temperature, which is why a dry cage dehydrates this genus faster than a desert lizard.

Add a brief spike after misting and keep a damp hide available at all times. The damp hide, packed with moist sphagnum moss, is where the lizard goes to assist a shed and to rehydrate.

Without a damp hide, sheds are more likely to stick, particularly around the toes and tail tip. Mist the enclosure once or twice a day. Dampen the substrate surface without pooling water, and let it dry between mistings so mold and bacteria do not build up.

A hygrometer, ideally digital with a probe, should stay in the enclosure permanently. Humidity under 30 percent for extended periods leads to dehydration and shedding problems. Humidity that stays near saturation with no dry period encourages skin and respiratory infections.

UVB and lighting

Alligator lizards are active by day and bask in filtered sun through vegetation, not in full open sun. A moderate UVB output is appropriate rather than the high output tubes used for basking desert species. A T5 UVB tube in the 2.0 to 5.0 range, mounted across a third to half of the enclosure length, supports vitamin D3 synthesis.

Replace fluorescent UVB tubes every 9 to 12 months, the interval the Merck Veterinary Manual gives, and keep them within 12 inches of the basking area. UVB output drops well before visible light does, so a bulb can look fine and still deliver little usable UVB.

Run lighting on a timer for 12 to 14 hours during spring and summer. Cut that to closer to 10 hours during fall and winter, mirroring natural day length. This shift supports the seasonal cycle described in the brumation section below.

For broader guidance on matching equipment to a species, see the heating and UVB guide.

Diet and feeding schedule

Alligator lizards are opportunistic carnivores, not strict insectivores. The California life history account lists grasshoppers, katydids, shield bugs, stink bugs and spiders.

It also lists other lizards and reports cannibalism. The San Diego Zoo fact sheet adds snails and tadpoles.

In captivity, a rotating mix of gut loaded crickets, dubia roaches, earthworms, and occasional snails covers that range well. The alligator lizard diet page goes deeper on prey choice. Prey size should be no wider than the space between the lizard’s eyes.

• Juveniles: small prey items daily, dusted with calcium powder at most feedings
• Subadults: prey every other day, calcium dusting at most feedings, vitamin D3 powder once or twice weekly if UVB exposure is limited
• Adults: prey two to three times a week, calcium dusting at most feedings

Overfeeding is a common problem in captivity. Alligator lizards will eat past satiety if food is always available. Obesity in this genus shows up as fat pads at the tail base and a lost waist behind the ribs.

For more on building out a feeder rotation, see the feeder insects guide. Species specific feeding notes are on the alligator lizard diet page.

Brumation

Alligator lizards from most of their range experience a genuine cold season. Washington records the northern species active from late March through October or November.

California notes winter inactivity for the southern species in cooler areas. Some coastal populations stay active year round.

They typically brumate, entering a period of reduced activity and feeding, from roughly late fall through winter. In captivity this usually means the lizard becomes far less active and eats little or nothing.

It will spend most of its time in a burrow or hide as ambient temperatures and day length drop. Keepers do not need to force brumation. Many alligator lizards will do it on their own if temperatures are allowed to fall seasonally rather than held constant year round.

If a lizard stops eating in fall as temperatures drop, that is consistent with normal brumation. It is not automatically a health emergency.

A lizard that stops eating while temperatures are still warm needs a veterinary check instead. So does one that loses real body condition over winter.

Handling, tail loss, and bites

Alligator lizards are not a docile, handling friendly species. Most individuals, especially wild caught ones, bite readily when grabbed. The bite can hold on with surprising strength for the animal’s size, but it is not dangerous and not venomous.

For a full rundown of what an alligator lizard bite involves, and why the genus is not venomous, see the bite and venom page.

Like many lizards, alligator lizards practice caudal autotomy. The tail snaps off at a fracture plane when grabbed or under enough stress. The detached piece keeps twitching to distract a predator while the lizard escapes.

State agencies and the San Diego Zoo note the loss carries a real cost. Survival odds drop, and a female may fail to reproduce that season.

The tail regrows over weeks to months. The replacement is supported by a cartilage rod rather than the original vertebrae, so it is usually shorter and a slightly different color. Support the body when handling, never grip or lift by the tail, and keep handling brief for a recently acquired animal.

Health and common problems

Wild caught alligator lizards very often carry internal parasites. A fecal exam by a reptile experienced veterinarian shortly after acquisition catches most of these early. Watch for the signs below, which warrant a veterinary visit rather than a wait and see approach.

• Retained shed, especially around toes or the tail tip, which can cut off circulation if not resolved
• Swelling at the jaw or along the limbs, which can indicate metabolic bone disease from inadequate calcium or UVB
• Persistent weight loss alongside continued feeding, which can point to a heavy parasite load
• Discharge from the nose, mouth, or eyes, or open mouth breathing, which can indicate a respiratory infection tied to humidity or temperature problems

A reptile veterinarian, rather than a general small animal practice, is the right first call for any of these signs. For a broader checklist of warning signs across lizard species, see the lizard health guide.

Lifespan

Wild alligator lizards face predation from snakes, shrikes, red tailed hawks and domestic cats. The San Diego Zoo fact sheet puts a possible wild lifespan at 10 to 15 years but calls it poorly documented. The AnAge longevity database records 9.8 years in captivity for the southern species, from a small sample.

Keeper reports of 15 years or more exist but have no institutional record behind them. Plan on a decade or more.

A decade long commitment is part of the welfare case against adding more wild lizards to captivity. A healthy, established captive animal represents a long term commitment. It is not a short term novelty.

Cost of keeping

Alligator lizards are not commercially bred at scale, so there is effectively no purchase price through legitimate channels. A legally acquired animal typically comes through a rehabilitation placement, an education program, or an existing keeper rehoming a captive bred or long term captive individual.

The ongoing cost is the enclosure, substrate, hides, a UVB fixture and heat source, a thermometer and hygrometer, and a steady feeder insect supply. That runs comparable to any mid sized insectivorous lizard setup. Replacement UVB tubes, feeder insects, and substrate refreshes are the main recurring expenses over the animal’s life.

Frequently Asked Questions

Is alligator lizard care difficult for a beginner?

It is more demanding than a beginner species like a leopard gecko. Alligator lizards are not domesticated, tend to be defensive, and often arrive with parasites from the wild. A first time keeper does better starting with a captive bred species and leaving wild alligator lizards where they are found.

Can I keep an alligator lizard I found in my yard?

That depends entirely on your state’s wildlife regulations, which vary and can require a permit or prohibit collection outright. Check with your state wildlife agency before deciding. Default to releasing it back where you found it if you are unsure.

Do alligator lizards need a heat lamp and UVB separately?

Most setups use a basking bulb for heat and a separate T5 UVB tube for ultraviolet output. A single bulb rarely delivers both at safe, adjustable levels. Mercury vapor combination bulbs exist, but they make it harder to dial in temperature and UVB independently.

How big does an alligator lizard enclosure need to be?

A single adult southern, northern, or Madrean alligator lizard needs roughly 20 to 30 gallons of floor space. The larger Texas alligator lizard needs 40 gallons or more. Floor space matters more than height for this ground dwelling genus.

Why did my alligator lizard’s tail come off?

Alligator lizards drop their tails as a defense reflex when grabbed or badly startled, a trait called caudal autotomy. Many other lizard families share this trait. The tail regrows over weeks to months but usually comes back shorter and a different shape than the original.

Are alligator lizards venomous?

No. Alligator lizards belong to the family Anguidae and have no venom glands or venom delivery system, unlike the distantly related beaded lizards and Gila monsters. A bite can still break skin and should be cleaned like any animal bite.