Tegu Lizard (Salvator merianae) Care Sheet

The Vivarium Vault: Comprehensive Care Sheets
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Tegu Lizard (Salvator merianae) Care Sheet

​A complete guide for the successful keeping of this large, highly intelligent, terrestrial, and omnivorous South American lizard.

​1. Overview & Commitment

  • ​Common Name: Argentine Black and White Tegu (B&W Tegu), Giant Tegu

  • ​Scientific Name: Salvator merianae (formerly Tupinambis merianae)

  • ​Natural Habitat: Humid grasslands, forests, and semi-arid regions of Argentina, Brazil, Paraguay, and Uruguay. They are terrestrial and spend time basking and burrowing.

  • ​Size: Very large. Males commonly reach 1.2 – 1.5 m (4 – 5 feet) in total length and are heavily built. Females are generally smaller.

  • ​Lifespan: 15 – 25+ years in captivity.

  • ​Temperament: Highly intelligent and can be socialized to be very docile. They are diurnal (daytime active) and require significant mental stimulation.

  • ​:warning: Commitment Warning: Tegus require a custom, walk-in enclosure for their adult lives and extensive daily interaction to maintain docility.

    ​2. Vivarium/Enclosure

    ​Tegus require immense floor space, sturdy construction, and security due to their strength and size.

    • ​Minimum Adult Enclosure (Crucial): For a single adult, a custom-built, sealed enclosure of at least 2.4 m x 1.2 m (8 ft x 4 ft) floor space is mandatory. Height is less important than floor space but should be at least 0.9 m (3 ft).

    • ​Enclosure Type: Custom-built wooden or PVC enclosures are ideal due to their size, heat retention, and security. They must be secured against the lizard’s attempts to push or burrow out.

    • ​Structure: Provide heavy logs, large flat basking stones/slates, and deep, secure hiding spots (e.g., large PVC tubes or custom wooden boxes).

    • ​Burrowing: Access to a large, deep digging area is essential for their mental well-being and natural behavior.

    • ​Water Dish: A large, heavy water bowl must be provided for soaking, drinking, and cooling.

    ​3. Substrate

    ​The substrate must be deep, safe, and moisture-retaining in the cool areas.

    • ​Recommended Substrate: A deep layer (at least 15 – 30 cm or 6-12 inches) of a mix such as Cypress Mulch, Organic Topsoil, and Coconut Fiber (Coco Coir).

    • ​Moisture: The deeper substrate should be kept damp (not wet) to provide the necessary ambient humidity and facilitate burrowing.

    ​4. Heating & Temperature

    ​Tegus require very high heat to properly digest their diverse diet.

    • ​Primary Heat Source: High-wattage Halogen Flood Lamps or powerful Metal Halide lamps are necessary to penetrate the substrate and air, connected to a dimming thermostat.

    • ​Basking Surface Temp (Extreme Hot Spot): 45°C – 50°C (115°F – 122°F). Measured directly on the basking surface.

    • ​Ambient Warm Side: 30°C – 32°C (86°F – 90°F).

    • ​Cool Side: 24°C – 27°C (75°F – 80°F).

    • ​Night Time Temperatures: Should drop significantly but remain above 21°C (70°F).

    • ​:red_exclamation_mark: Crucial Safety Tip: All heating elements must be secured or caged to prevent burns.

      ​5. Lighting & UV

      ​As large, diurnal, sun-basking lizards, intense UV light is crucial.

      • ​UVB Light: A high-output 12% or 14% T5 linear fluorescent tube is mandatory and must span at least two-thirds of the enclosure length.

      • ​UV Index (UVI): The UVI in the basking zone should be high, in the range of 3.0 to 6.0 (Ferguson Zone 3 or 4).

      • ​Ambient Light: Strong ambient lighting is recommended for a clear day/night cycle.

      ​6. Humidity & Hydration

      ​Tegus require high humidity, especially when young, to ensure proper shedding.

      • ​Ambient Humidity: Must be maintained between 60% and 80%. Use a digital hygrometer for accurate monitoring.

      • ​Misting/Soaking: Misting the enclosure daily and providing a large soaking tub are key to maintaining hydration and humidity.

      • ​Aestivation/Brumation: If temperatures and photoperiods drop significantly in winter, they may enter a period of brumation (deep sleep) that requires specific management (often seen in adults, not juveniles).

      ​7. Diet & Feeding

      ​Tegus are true omnivores and require a highly varied diet that shifts from protein-heavy (juveniles) to plant-heavy (adults).

      • ​Juveniles (0-1 year): Focus on protein (70%): insects (Dubia, crickets), whole prey (mice, chicks), and lean ground turkey/poultry. 30\% \text{ produce}. Feed daily.

      • ​Adults (1+ year): Shift to mostly produce (60-70%): dark leafy greens, vegetables (squash, carrots), and fruits (mango, banana) offered as treats. Reduce protein (30-40%) to whole prey, eggs, and lean protein only a few times a month. Feed every 3-5 days.

      ​Supplementation:

      • ​Calcium Powder (Pure): Dust non-whole prey items 4-5 times per week.

      • ​Calcium with D3 and Multivitamin: Dust non-whole prey items 1–2 times per week.

      • ​:warning: Obesity Warning: Tegus are prone to obesity and kidney/liver failure due to high-fat diets. Diet must be strictly monitored and weighed.

        ​8. Handling & Maintenance

        • ​Socialization (Crucial): Tegus are highly intelligent and require consistent, calm, and daily handling from a young age to ensure docility as an adult. They can be very friendly, but an unsocialized adult can be dangerous.

        • ​Caution: They possess powerful jaws, sharp teeth, and a strong, whip-like tail used defensively.

        • ​Maintenance: Daily spot cleaning of feces and uneaten food is essential. The soaking tub must be kept impeccably clean.