Blue-Tongued Skink (Tiliqua spp.) Care Sheet
A complete guide for the successful keeping of this large, diurnal, terrestrial lizard, focusing on the commonly kept Northern subspecies.
1. Overview & Natural Habitat
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Common Name: Blue-Tongued Skink, BTS
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Scientific Name: Tiliqua spp. (Most common: Northern - T. s. intermedia or Indonesian/Irian Jaya - T. gigas)
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Natural Habitat: Woodlands, grasslands, and semi-arid regions of Australia (Northern) or high-humidity tropical areas (Indonesian subspecies). They are terrestrial and spend much of their time burrowing.
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Size: Adults reach a total length of 45 – 60 cm (18 – 24 inches).
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Lifespan: Can live 15 – 20+ years in captivity.
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Temperament: Generally curious, slow-moving, and docile, making them excellent pets. They are diurnal (daytime active).
2. Vivarium/Enclosure
Blue-Tongued Skinks are heavy-bodied and require significant floor space for roaming and digging. Height is less critical than length and depth.
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Minimum Enclosure Size (Adult): 120 x 60 x 60 cm (48 x 24 x 24 inches) is the widely accepted minimum for floor space (a 120-gallon equivalent). 6 ft (180 cm) long is strongly recommended for active adults.
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Enclosure Type: Wooden or PVC enclosures are highly recommended as they retain heat and humidity better than glass. Good ventilation is essential.
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Hides/Shelter: Provide multiple secure hides or caves (such as cork tubes or rock piles) on both the warm and cool ends. A large, flat basking stone should be placed under the heat source.
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Enrichment: Use secure branches, logs, and rocks for climbing a short distance, as well as providing visual barriers and things to explore.
3. Substrate
A deep, natural substrate is crucial to allow for natural burrowing and to help maintain species-appropriate humidity.
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Best Natural Substrate Mix: A deep layer (at least 10 – 15 cm or 4-6 inches) of a mix such as 60% Organic Topsoil and 40% Play Sand (silica-free). Alternatively, Cypress Mulch or a mix of Cypress Mulch and Coco Coir can be used, especially for Indonesian species requiring higher humidity.
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Burrowing: Skinks love to burrow and partially submerge themselves; ensure the substrate is deep enough to allow this.
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Avoid: Reptile carpet, calci-sand, and pure cedar/pine shavings.
4. Heating & Temperature
Blue-Tongued Skinks require a strong, targeted overhead heat source to create a wide thermal gradient.
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Primary Heat Source: Halogen Flood Lamps or Deep Heat Projectors (DHP) are the best sources, as they mimic the sun’s infrared rays. This must be connected to a dimming thermostat.
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Basking Surface Temperature (Hot Spot):
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Northern BTS (T. s. intermedia): 40°C – 46°C (105°F – 115°F).
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Indonesian BTS (T. gigas spp.): 37°C – 40°C (100°F – 105°F).
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This temperature is measured directly on the basking platform.
rm.
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Cool Ambient Side: 21°C – 27°C (70°F – 80°F).
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Night Time Temperatures: Temperatures can safely drop to 18°C (65°F). If supplemental heat is needed, use a Ceramic Heat Emitter (CHE) on a thermostat, as it provides heat without light.
Crucial Safety Tip: All heating elements must be connected to a Thermostat. Use an infrared temperature gun to accurately measure the basking surface temperature.5. Lighting & UV
UVB lighting is highly recommended for all Blue-Tongued Skink subspecies to promote optimal health and D_3 synthesis.
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UVB Light: A high-output 10% or 12% T5 linear fluorescent tube is recommended. The bulb should cover at least 2/3rds of the enclosure length.
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UV Index (UVI): The UVI in the basking zone should be in the range of 3.0 to 4.9 (Ferguson Zone 3).
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Photoperiod: Provide a consistent 12-14 hour day/night cycle. All lights must be turned off at night.
6. Humidity & Hydration
Humidity needs vary significantly by subspecies. Maintaining an appropriate moisture level is vital for shedding.
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Northern/Eastern BTS: Average ambient humidity should be kept at 40% – 60%.
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Indonesian BTS (e.g., Irian Jaya, Merauke): Average ambient humidity should be kept higher, at 60% – 80%.
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Hydration: Provide a large, shallow water bowl. They should be able to easily climb in and out.
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Humid Hide: A moist hide filled with damp sphagnum moss on the cooler side can be very beneficial for all species, especially during shedding.
7. Diet & Feeding
Blue-Tongued Skinks are true omnivores and require a highly varied, balanced diet. Their diet should be low-fat and low-sugar.
Diet Ratio Breakdown (By Volume):
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Juveniles (under 8 months): 70% Protein/Insects and 30% Fresh Greens/Veggies. Feed daily.
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Adults (over 8 months): 50% Fresh Greens/Veggies, 40% Protein/Insects, and 10% Fruit/Treats. Feed 1-2 times per week.
Staple Foods:
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Proteins/Insects: High-quality, low-fat wet dog food (grain-free/no artificial colors/no beef), Dubia Roaches, Crickets, Black Soldier Fly Larvae, and occasional feeder snails or earthworms.
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Greens/Veggies (Daily): Collard Greens, Turnip Greens, Dandelion Greens, Escarole, and cooked squash. Variety is key.
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Fruit (Treat Only - Max 10%): Berries, melon, banana (sparingly).
Supplementation Schedule:
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Calcium Powder (Pure): Dust the entire meal 3-4 times a week.
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Multivitamin: Use a reptile multivitamin powder 1-2 times per month.
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Note on Dog Food: If using dog food, select a high-quality, reputable brand and ensure it is mixed with a higher percentage of chopped fresh vegetables/greens (especially for adults) to lower the overall protein and fat content.8. Handling & Temperament
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Taming: Skinks are generally placid and tolerate handling well. Allow them to acclimate for a few weeks before starting short, gentle handling sessions.
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Handling: Always support the skink’s entire body. They rarely bite unless they mistake a finger for food, but their blue tongue is a bluff display used to scare off predators.
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Hygiene: Always wash your hands thoroughly before and after handling the skink or cleaning its habitat.
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