Argentine Black and White Tegu

Overview

Tegus are intelligent, inquisitive lizards. With regular, gentle handling they can be tamed and even trained ¹². Most reach 4 to 5 feet and 8 to 15 pounds, mature around three years, and live ten to fifteen years, with some reaching twenty ¹². A tegu is a commitment closer to a dog than to a typical lizard: it needs a custom enclosure, daily attention and a sturdy keeper.

Natural history

The Argentine black and white tegu comes from South America, where it lives on the ground and forages widely as an opportunistic omnivore. It hunts live prey, scavenges carrion and eats fruit ¹³. Tegus from temperate regions like Argentina brumate (go dormant) through the cooler months ¹. Released and escaped pets have established invasive populations in Florida, where they threaten native ground-nesting wildlife ⁴.

Enclosure

• Adults. At least 6 ft long × 3 ft wide × 3 ft high ¹. CEX recommends 6–8 ft long × 3–4 ft deep × 3 ft high once a tegu reaches one to two years ².
• Hatchlings. A 20-gallon enclosure, briefly, moving to 40 gallons or larger as they grow ².
• Build. The enclosure must be sturdy and escape-proof. A locking door is recommended, especially for defensive adults ².
• Swimming. Tegus swim well. A soak in a large tub twice a week is good exercise and enrichment ².

Temperature & lighting

Monitor with digital or infrared thermometers ¹. Tegus need 12–14 hours of UVB a day. Use a high-quality reptile UVB lamp placed as the manufacturer directs, and add natural sunlight when you can ¹.

Many pet tegus try to brumate from around mid-September. You can allow it, or adjust heat and light to prevent it; plan this with your vet ¹.

Humidity

Keep relative humidity around 80% ¹. Mist daily, keep the substrate slightly moist and track it with a hygrometer ¹.

Substrate

Use layers: a base of butcher paper, newspaper or tarp, then a deep section (up to 24 in / 60 cm) of topsoil, cypress mulch or aspen for burrowing. Leave a paper-only area for feeding so the tegu does not swallow substrate ¹.

Diet & supplementation

Tegus are omnivores, and their needs change with age ¹².

• Juveniles (to about 1 year). Feed live insects daily: dubia roaches, soldier fly larvae, crickets ¹.
• Subadults (1–3 years). Gradually add larger prey and plant matter ¹.
• Adults (3+ years). Feed about every three days ¹:
  • Frozen-thawed rodents, hard-boiled egg, lean meats such as turkey, and occasional fish.
  • A wide variety of vegetables.
  • Limited fruit.
  • A complete commercial tegu diet can be a base.
• Portion control. Too much fruit causes obesity and gut upset. Too much animal protein can harm the kidneys ¹. Obesity is common, so feed adults set meals, not a constant supply ².
• Supplements. Lightly dust food with calcium (without D3) at every feeding, and add a reptile multivitamin once a week ¹.

Handling & temperament

Regular handling makes most tegus docile. Some even seek out interaction ¹². Sub-adults can be flighty and wild-caught animals defensive, so build trust slowly ². Wash your hands after handling, as reptiles can carry Salmonella ⁶.

Health

Common issues

• Obesity, the most common diet problem in adult tegus ².
• Kidney and metabolic problems from too much animal protein ¹.
• Gut impaction if they swallow substrate while feeding ¹.
• Metabolic bone disease without enough UVB and calcium ¹.

When to see a vet

See an exotic-animal vet for appetite loss lasting more than a week outside brumation, noisy breathing or stuck shed. Open-mouth breathing, limp or oddly angled limbs, large open wounds or an unresponsive animal are emergencies ⁷.

Breeding overview

Tegus mature at about three years ¹². Adult males are larger, with pronounced jowls and two small raised scales near the vent at the base of the tail; females lack these ¹. Juveniles are hard to sex ¹.

Legal & ethics

• CITES. Salvator merianae is listed on CITES Appendix II ⁵.
• Florida. In 2021, the Florida Fish and Wildlife Conservation Commission adopted rules restricting the import, breeding and possession of high-risk invasive reptiles, including Argentine tegus ⁴. Check your state's rules before you buy.
• Never release a tegu. Escaped and released pets have established invasive populations in Florida ⁴.

Sources

1. Tegu Care · Tree of Life Exotic Pet Medical Center
2. Tegu Care · Chicago Exotics Animal Hospital
3. Salvator merianae · The Reptile Database
4. Argentine Black and White Tegu · USDA National Invasive Species Information Center
5. CITES listing: Salvator merianae · Species+ (UNEP-WCMC and CITES Secretariat)
6. Salmonella, Feeder Rodents, and Pet Reptiles and Amphibians · U.S. Food and Drug Administration
7. When Should My Reptile See a Veterinarian? · Tree of Life Exotic Pet Medical Center

Last reviewed 2026-10-24 by Novel Fauna. This guide is general husbandry information, not veterinary advice. When an animal is sick, see a veterinarian experienced with exotic animals.

Revision history

1. 2026-10-24 Library: 50 cited care guides, /library/[slug] route, coming-soon cards, SLUGS.txt synced to species.guide_slug 228ce54
2. 2026-10-24 WIP: library guides (lizards) 478b100

Evidence grades: Novel Fauna editorial: source classification, not yet expert-reviewed, 2026-10-25. What the grades mean.

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