Lace Monitor (Varanus varius) Care Sheet

The Vivarium Vault: Comprehensive Care Sheets
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Lace Monitor (Varanus varius) Care Sheet

​A complete guide for the successful keeping of this large, highly active, and advanced-level arboreal monitor lizard from Eastern Australia.

​1. Overview & Commitment Warning

  • ​Common Name: Lace Monitor, Tree Goanna

  • ​Scientific Name: Varanus varius

  • ​Natural Habitat: Open and closed forests, grasslands, and woodlands of Eastern Australia. They are semi-arboreal (spending significant time climbing trees) and forage vast distances on the ground.

  • ​Size: Adults commonly reach 1.5 – 2.1 m (5 – 7 feet) in total length, with a long, powerful tail. They are heavy-bodied and extremely strong.

  • ​Lifespan: 20 – 30+ years in captivity.

  • ​Temperament: Highly intelligent, curious, and food-motivated. They can be flighty when young but may settle with consistent, confident handling. They are diurnal (daytime active).

​:warning: Extreme Commitment: Due to their intelligence, size, and activity, they require a walk-in, custom-built habitat for proper long-term welfare. They are extremely powerful and their claws and bite pose a significant risk.

​2. Vivarium/Enclosure

​Lace Monitors require an enclosure that provides immense floor space, but critically, also significant climbing height.

  • ​Minimum Adult Enclosure (Walk-In): The enclosure must be able to accommodate the monitor’s length, width, and height. A commonly cited minimum is a custom-built enclosure that is 3.6 m (12 ft) long, 1.8 m (6 ft) deep, and 2.4 m (8 ft) high. (Source 1.8, 1.5)

  • ​Enclosure Type: Custom-built wooden or PVC enclosures with sealed seams are necessary to maintain heat and humidity. Security and sturdiness are paramount due to the animal’s strength.

  • ​Structure: Provide numerous sturdy, thick logs, large diameter branches, and ledges arranged both vertically and horizontally. The structure should allow the monitor to climb to within a safe distance of the basking lights.

  • ​Hides: Provide multiple secure hides (logs, large cork rounds) both on the ground and high up in the climbing structure, allowing the monitor to feel safe at any level of the temperature gradient.

  • ​Water: A large, sturdy water dish must be provided, big enough for the entire monitor to soak in, as they often defecate in their water and enjoy soaking.

​3. Substrate

​The substrate should be manageable for a large, active lizard and help maintain appropriate humidity.

  • ​Recommended Substrate: A deep layer (10 – 20 cm or 4-8 inches) of a mix of cypress mulch and organic topsoil is ideal. The depth allows for occasional digging and helps with humidity. (Source 1.1)

  • ​Substrate Management: Monitor enclosures require daily spot-cleaning and frequent full cleaning due to the volume of waste.

​4. Heating & Temperature

​Lace Monitors require extremely high basking temperatures to fuel their high metabolism.

  • ​Primary Heat Source: Multiple, high-wattage overhead sources (e.g., Halogen Flood Lamps or Deep Heat Projectors (DHP)) are required to create a large basking zone that covers the entire body. These must be connected to a dimming thermostat. (Source 1.2, 1.6)

  • ​Basking Surface Temp (Hot Spot): 45°C – 55°C (115°F – 130°F). This must be measured directly on the basking surface (rock/wood). (Source 1.1)

  • ​Cool Ambient Side: 25°C – 30°C (77°F – 86°F). (Source 1.2)

  • ​Night Time Temperatures: Should not drop below 21°C (70°F). (Source 1.5)

  • ​:red_exclamation_mark: Crucial Safety Tip: All heating elements must be securely caged or placed far enough away to prevent burns, as these animals will climb directly to the heat source.

    ​5. Lighting & UV

    ​As a highly active, diurnal, basking lizard, strong UV is essential.

    • ​UVB Light: A high-output 12% or 14% T5 linear fluorescent tube is mandatory and should cover the majority of the enclosure, especially near the basking spot.

    • ​Ambient Light: Use powerful, full-spectrum LED lighting to simulate daylight intensity and support natural behavior.

    • ​Photoperiod: Maintain a consistent 12-14 hour day/night cycle.

    ​6. Humidity & Hydration

    ​Lace Monitors require moderate to high humidity, especially during shedding.

    • ​Ambient Humidity: Should be maintained between 50% and 70%. (Source 1.5)

    • ​Hydration: A very large, clean water dish is necessary for drinking and soaking. Expect them to defecate in the water frequently; it must be checked and cleaned daily.

    ​7. Diet & Feeding

    ​Lace Monitors are carnivores that primarily eat carrion and whole prey in the wild. Their captive diet must be lean, varied, and low in fat to prevent serious health issues (fatty liver disease).

    • ​Staple Diet: Should consist of lean, whole prey items: whole mice, rats, quail, and chicks (the entire carcass provides bones, organs, fur/feathers, which are vital). (Source 1.1)

    • ​Variety/Supplement: Offer occasional large invertebrates (crickets, roaches) and reptile/bird eggs. Non-whole prey protein (e.g., lean ground turkey, fish) should be used sparingly. (Source 2.1)

    • ​Feeding Frequency:

      • ​Juveniles: Feed every 1-2 days.

      • ​Adults: Feed a substantial meal once every 7-10 days. Overfeeding leads to obesity and early death.

    ​Supplementation:

    • ​Supplementation: Dust whole prey items with a calcium/multivitamin supplement once every few feedings. Since whole prey is used, the main focus is on offering variety. (Source 1.6)

    ​8. Handling & Temperament

    • ​Temperament: Highly intelligent and can be tamed to tolerate handling, but they remain extremely powerful, fast, and capable of inflicting significant damage.

    • ​Handling: Handling should be limited to necessary maintenance. Never trust these animals. They possess sharp teeth and long, razor-like claws that can cause deep lacerations simply by climbing on you.

    • ​Safety: Monitor lizards should be kept behind a locking door. When performing maintenance, be aware of where the lizard is at all times.