Blue-Tongued Skink

Is a blue-tongued skink right for you?

The blue-tongued skink (genus Tiliqua) gets its name from the striking blue tongue it flashes when it feels threatened — a calm, curious lizard. It's not as well known as the bearded dragon, but it's considered a similarly forgiving starter species; the difference is that its diet isn't limited to insects but is genuinely omnivorous (both animal and plant food).

The honest question when deciding: can you both source/raise insects and consistently prepare vegetables and fruit? This species doesn't do well on a one-track diet.

Before you adopt

Legal status. Blue-tongued skink species are generally not listed on CITES and are not considered endangered; most animals in the pet trade are captive-bred. Still, ask the seller for the exact species (Tiliqua scincoides, Tiliqua gigas, etc.) and its source.

Never skip UVB. This species is diurnal and, like the bearded dragon, cannot produce vitamin D3 or absorb calcium without UVB. A UVB lamp loses its output within a few months even while still giving visible light; it should be replaced according to the manufacturer's instructions, generally every 6-12 months.

Check before buying. Eyes should be open and clear, the body should look well-fed (ribs shouldn't be prominent), and there should be no retained shed on the tail or toes; don't take an individual that hides constantly or has no appetite.

Size and lifespan. Adults reach 45-60 cm depending on species and subspecies. Average lifespan is 15-20 years; some sources report individuals living past 30 with good care.

Enclosure set-up

Size

• Juvenile: can be kept temporarily in a smaller enclosure, but not for long.
• Adult: at least 1 m² of floor space (e.g. 120x60 cm) and at least 45 cm of height. This species is terrestrial, so floor area matters more than height; bigger is always better.

Temperature gradient

Measure at the basking surface with a digital probe thermometer. The heat lamp must always be controlled by a thermostat or dimmer.

UVB (non-negotiable): A T5 HO linear UVB lamp, 10-12% output, on for 10-12 hours a day. UVB does not pass through glass or plastic; the lamp must be inside the enclosure or above a mesh screen.

Substrate: A soil/coconut fibre mix or reptile carpet; some depth helps support digging behaviour. Fine sand and plain gravel carry an ingestion risk.

Decor: A flat rock for basking, at least one hide, and a shallow, tip-proof water bowl.

Feeding

The blue-tongued skink is a genuine omnivore; in the wild it eats a wide range including insects, snails, flowers, fruit, and carrion.

General ratio: In adults, roughly 40-50% animal protein (insects, and some keepers use small amounts of lean cooked chicken or commercial cat/dog food sparingly) to 50-60% vegetables and fruit. Juveniles and young animals can be kept slightly higher in protein.

Suitable insects: Dubia roaches, crickets, black soldier fly larvae; size should not exceed the width of the animal's head.

Suitable vegetables (the bulk of the plant portion): Collard greens, endive, squash, sweet potato, bell pepper, peas.

Suitable fruit (limited, treat-like): Strawberry, melon, papaya, apple; should make up a small part of the total diet.

Do not give: Avocado, onion, garlic, chocolate, alcohol, overly salty or processed human food, insects caught at home (pesticide risk).

Supplements: Dust insects and vegetables with calcium powder without D3 a few times a week; multivitamin once a week.

Frequency: Adults every other day or one meal a day; juveniles once a day, sometimes more often.

Health and lifespan

Average lifespan is 15-20 years; some individuals approach 30.

Signs that mean a vet visit:

• Loss of appetite, weight loss, sunken eyes
• Soft jaw, bent legs, tremor (can indicate metabolic bone disease)
• Difficulty breathing, open-mouthed breathing, nasal discharge
• Cessation or change in droppings
• Prolonged hiding, ceasing to bask
• Retained skin during shedding, particularly on the toe tips

Common problems:

• Metabolic bone disease (MBD): caused by insufficient UVB or calcium/D3 deficiency; soft jaw, bent legs, fractures. Preventable; advanced cases leave permanent damage.
• Internal parasites: cause digestive trouble and weight loss; an annual faecal test is recommended.
• Respiratory infection: caused by low temperature or high humidity; shows as wheezing and nasal discharge.
• Mites: small moving spots on the skin, accompanied by restlessness and frequent soaking.
• Obesity: results from a diet too heavy in fruit and protein; this species gains weight easily.
• Shedding problems: skin stays in patches at low humidity, can cut off circulation on the toe tips.
• Spinal deformity: can develop from prolonged calcium imbalance or an unsuitable substrate.

Salmonella: wash your hands after every contact; young children, pregnant women, and immunocompromised people should be especially careful.

Handling and behaviour

The blue-tongued skink's calm temperament makes it one of the species that respond well to handling.

1. Do not touch it for the first week. It needs to settle into the new environment; only feed it.
2. Lift it supporting from below. Support the chest and belly fully — never leave the body hanging unsupported.
3. Short sessions. Start with 10-15 minutes and increase gradually.
4. Avoid sudden movements. Building trust takes time, especially with newly acquired individuals.

Reading the behaviour:

• Flashing the blue tongue and hissing: a defensive display when it feels threatened or uncomfortable, not aggression.
• Puffing up the body: a defensive response meant to look bigger.
• Constant hiding: seen while settling into a new environment or under stress; if it persists, review the set-up.

Do not house more than one individual. This species is generally territorial and lives alone outside the breeding season; keeping two together can cause stress and fighting.

History and life in the wild

The blue-tongued skink genus (Tiliqua) lives across various habitats in Australia, Indonesia, and New Guinea, including open woodland, scrub, and arid regions. It's a slow-moving, ground-dwelling lizard; when threatened it opens its mouth and displays its dark blue tongue to try to deter predators.

Availability of Australian-native species in the pet trade is limited by Australia's ban on wildlife exports, so most animals in the trade are Indonesian-origin species (such as Tiliqua gigas) or come from lines bred abroad for a long time. Its calm temperament and omnivorous diet make it a distinctive and appealing species compared with many other lizards.