Salvator merianae
Argentine Black and White Tegu
The Argentine black and white tegu is a large, intelligent lizard that can grow beyond 1.2 m. It needs a very large enclosure, varied diet and experienced handling, and is invasive in parts of the US.
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At a glance
- Scientific name
- Salvator merianae
- Family
- Teiidae
- Origin
- Argentina and surrounding regions
- Lifespan
- 15–20 years
- Adult size
- 90–120 cm
- Weight
- 3–7 kg
- Temperament
- Famously dog-tame when well socialised, but powerful, food-motivated and demanding.
- Activity level
- High; an active, intelligent forager.
- Social needs
- Solitary; bonds with keepers through regular calm handling.
- Intelligence
- Exceptional for a lizard; learns targets, names and routines.
- Noise
- Huffs and tail-thumps when annoyed.
Housing and environment
- Housing
- Adults need a custom enclosure of at least 240 × 120 × 120 cm with deep burrowing substrate.
- Space requirement
- Effectively needs its own room.
- Temperature
- Basking 40–45 °C; ambient 24–30 °C.
- Humidity
- 60–80% — much higher than most large lizards; essential for healthy sheds.
- Exercise
- Needs daily roaming time in a secure room outside the enclosure.
- Grooming
- Soaks and sheds; nails may need trimming.
Life stages and changing needs
Expanded care guidance · Updated 7 October 2026 · Not professionally reviewed
Juvenile
Young Argentine tegus grow explosively — from hatchling to over a metre within their first couple of years — and this is the critical window for the frequent, calm handling that produces a tractable adult. Juveniles need a large enclosure with a hot basking zone around 40 to 43 degrees Celsius, strong UVB, deep substrate for burrowing and high humidity to support healthy shedding; undersized starter setups are outgrown within months, so plan the adult enclosure from day one.
Adult
Adult tegus are among the largest commonly kept lizards and need a custom enclosure of at least 2.5 by 1.2 metres with intense basking heat, UVB, deep burrowing substrate and a large water area; they are highly intelligent, often described as dog-like, and need daily interaction, enrichment and out-of-enclosure exploration to stay sane and tame. They brumate seasonally, slowing or refusing food for weeks in winter, which is normal if the animal is healthy — but a first-time keeper should confirm the difference between brumation and illness with a reptile vet.
Senior
Tegus can live fifteen to twenty years. Older animals remain large and powerful but may develop arthritis, gout and kidney problems, particularly if their diet has been too rich in protein over the years; adjust basking access for stiffer joints, keep body condition lean, and schedule periodic bloodwork with a reptile vet. A well-socialised senior tegu is typically calm and handleable, but its size means even a defensive reaction can injure, so respect for the animal's signals remains lifelong.
Diet and feeding
Omnivorous: whole prey, eggs, insects, fruit and vegetables; prone to obesity.
Tegus are omnivores: the diet should combine whole prey items such as appropriately sized rodents and chicks, eggs, insects, and a substantial proportion of fruit and vegetables — many keepers under-feed the plant portion, contributing to obesity and kidney strain. Feed juveniles daily and adults two to three times a week, adjusting to body condition, because tegus are enthusiastic eaters that become obese easily.
Avoid feeding only rodents, processed meats, or seasoned human food, and use calcium and vitamin supplementation as advised by a reptile vet, particularly for growing animals. A large water dish for drinking and soaking should be refreshed daily; tegus frequently defecate in water, and hygiene here directly affects skin health.
Daily care and ongoing checks
Every day
Check basking and ambient temperatures, UVB function and humidity daily — shedding problems in tegus almost always trace back to humidity that is too low. Refresh the water, spot-clean droppings, and confirm the enclosure locks are secure, because an escaped tegu is a genuine safety and legal problem.
Regular maintenance and prevention
Spend time with the animal every day: tegus are social, intelligent lizards that deteriorate behaviourally when ignored, and daily interaction is also your health check — watch for a clear-eyed, alert, responsive animal with a good feeding response, and note any limping, stuck shed, or unusual hiding.
Behaviour and compatibility
Brumates (a winter dormancy) for months each year, which surprises unprepared owners.
- With children
- Only with experienced adult supervision; a food-associated bite is serious.
- With other animals
- Will hunt small pets; supervise rigorously.
- Training difficulty
- Highly trainable with food rewards, but requires expert commitment.
Health
- Obesity and fatty liver disease
- Metabolic bone disease
- Retained shed
- Respiratory infection in cold, dry conditions
Only for experienced keepers with space, budget and an exotic vet willing to treat large lizards.
Special care requirements
See the housing, diet and health sections — this species has needs that are easy to underestimate.
Social intelligence and wide-ranging enrichment
Argentine tegus are among the most cognitively advanced reptiles, capable of complex social bonds, and they require high-level, constant mental stimulation and enrichment. They are very large, wide-ranging, intelligent predators, meaning housing and care are major commitments that require serious, well-researched infrastructure.
Before you take one on
Sources and further guidance
These welfare and veterinary resources inform general husbandry advice; they do not certify this profile or replace a species-experienced professional. Confirm exact environmental settings and feeding plans for your animal.
Can your home meet argentine black and white tegu needs?
- Plan for a lifespan of 15–20 years, including holiday cover and, where one is available, a vet familiar with this species. Lifespan ranges are not guarantees.
- Arrange the social setting before arrival. Social guidance for this species: Solitary; bonds with keepers through regular calm handling. Do not assume another animal of any species is a suitable companion.
- Habitat priority for this species: Effectively needs its own room. Make sure your setup can provide this consistently. Measure temperatures and humidity with thermometers and a hygrometer rather than guessing.
- Key care point: See the housing, diet and health sections — this species has needs that are easy to underestimate. Discuss diet and any specialist needs with the supplier, rescue and a vet who treats this species, and check local legal requirements before acquiring an animal.
Educational reference, not an individual diagnosis or a verified professional review. Read our editorial policy.
Guidance libraries and further reading
These organisations publish relevant guidance. Their links are further reading, not evidence that they have reviewed this page.