How to Raise a Happy Northern Blue Tongue Skink
I've kept blue tongue skinks for years, and the northern (Tiliqua scincoides intermedia) is the one I hand to anyone who wants a lizard that acts like a small, opinionated dog. They're big, calm, food-motivated, and they recognize routine. None of that happens by accident, though. A happy skink is the output of a few husbandry decisions you make on day one, so let me walk you through exactly how I set mine up and keep them thriving.
What you're actually keeping
Northern blue tongues come from the savanna woodlands and grasslands of northern Australia, where it's warm, bright, and fairly dry. They're the largest of the common blue tongue subspecies, with adults running 18-24 inches nose-to-tail and a heavy, sausage-shaped body on short legs. The famous cobalt tongue is a bluff display: when startled, they flatten out, hiss, and flash it to look like something you shouldn't bite.
They're diurnal (active in daylight), terrestrial (they live on the ground, not in branches), and solitary. That last point matters: do not house two together. They will compete, stress, and sometimes injure each other. One skink, one enclosure.
Setting up the enclosure
Floor space beats everything else here. Because these are ground animals, I care about length and width, not height.
- Minimum: a 4 ft x 2 ft footprint for one adult. A 40-gallon breeder is the absolute floor and honestly a little tight for a full-grown northern.
- Better: a 4x2 front-opening reptile enclosure or a PVC cage. More room means more thermoregulation options and a more active, curious animal.
- Lid/security: they're strong and will push at gaps, so a secure top or front latch is non-negotiable.
Substrate
I want something that holds a light burrow and doesn't spike humidity. Good choices:
- Cypress mulch
- A topsoil/play-sand/coco-coir mix (no added fertilizer or perlite)
- Aspen (works but molds if it gets damp, so keep it dry)
Give them 3-4 inches so they can dig in and feel covered. Never use cedar or pine shavings — the aromatic oils are toxic to reptiles.
Heat, light, and UVB
This is where most beginners go wrong, so be precise and measure with real tools (a digital probe thermometer and an infrared temp gun, not the dial stickers).
| Zone | Target |
|---|---|
| Basking surface | 95-105F (measured on the spot itself) |
| Warm ambient | ~80F |
| Cool end | 75-80F |
| Night drop | high 60s is fine |
Run a halogen flood bulb for the basking spot — it throws the bright, focused heat these sun-baskers actually want. Control it with a thermostat or dimmer so you can dial the surface temp in.
Then add UVB. Use a linear T5 high-output tube (around 6-7%, the "Zone 3" / open-sun strength), mounted over the warm half so the skink can choose its dose. UVB lets them make their own vitamin D3, which drives calcium metabolism and prevents metabolic bone disease. Coil bulbs and "combo" basking bulbs don't cut it; use a proper tube and replace it every 12 months even though it still glows.
Put both heat and UVB on a 12-hours-on timer to give a clean day/night cycle.
Humidity
Northerns are the dry-climate subspecies. I keep ambient humidity around 35-50%, with a brief bump during shed. A large water bowl plus an occasional light mist is usually plenty. Chronic high humidity on dry substrate is how you get respiratory infections and scale rot, so err drier and watch the hygrometer.
Hides and furniture
Give at least two hides — one on the warm side, one on the cool side — so the skink never has to choose between hiding and being the right temperature. Add a cork flat, a half-log, some sturdy rocks, and a clump of (fake or safe live) foliage. They're ground-bound but they love to wedge under and shove things around.
Feeding for the long haul
Northern blue tongues are omnivores, and a varied diet is the whole game. I aim for roughly half animal protein, half plant matter, with fruit as an occasional topper rather than a staple.
Protein
- Gut-loaded insects: dubia or discoid roaches, crickets, black soldier fly larvae, the occasional superworm
- High-quality, grain-free canned dog food (a recognized convenience staple for blue tongues, used in moderation)
- Cooked egg now and then
- Snails (captive-raised) are a natural favorite — those powerful jaws are built for crushing shells
Feeder insects are where you actually buy something, and they're worth buying clean and well-fed. I keep a rotation of discoid roaches as the protein backbone — they're meaty, easy to gut-load, and don't climb smooth walls or fly, which makes them far less of a headache than crickets.
Plants
Build the plant half from leafy greens and squashes:
- Collard, mustard, dandelion, and turnip greens
- Endive, escarole, watercress
- Butternut/summer squash, green beans, grated carrot
Skip spinach and chard as staples — they're high in oxalates that bind calcium. Avoid avocado, rhubarb, and citrus entirely.
Fruit and supplements
Berries, mango, and papaya are fine as small, occasional treats; they're sugary, so don't overdo it. Dust insect feedings with a plain calcium powder (no D3 if you're running good UVB), and use a multivitamin lightly once a week. The "calcium without phosphorus" instinct is right — nearly every feeder insect is phosphorus-heavy, so the calcium dust is what rebalances the ratio.
Schedule
Juveniles: daily to every other day. Adults: every 3-4 days. Pull uneaten fresh food before it spoils, and watch the waistline — captive blue tongues get fat easily.
Handling and trust
These are one of the few lizards that genuinely tame down. The trick is patience and predictability.
Let a new skink settle for a week before you handle it — eating reliably is your green light. Then approach from the side, never swooping down from above (that reads as a hawk). Scoop and support the whole body, one hand under the chest, one under the belly and tail. Keep early sessions short, a few minutes, and build up. Hand-feeding a favorite food near the enclosure is the fastest way to turn a skittish skink into one that climbs into your hand.
Read the body language: a relaxed skink tongue-flicks and explores; a stressed one flattens, hisses, and puffs. If you get the warning display, give it space and try again later. Consistent, gentle handling a few times a week beats one long marathon session.
Cleaning and routine
- Daily: spot out waste and uneaten food, refresh and scrub the water bowl.
- Weekly: stir loose substrate, wipe down hides and surfaces with a reptile-safe cleaner, confirm your temps and UVB are still on spec.
- Monthly or as needed: strip and replace substrate, disinfect the whole enclosure and furniture, then re-bed.
A clean, stable enclosure is most of preventive medicine for this species.
Health: what to watch for
Northerns are hardy, but a handful of issues account for most vet visits:
- Respiratory infection — wheezing, mucus, open-mouth breathing. Almost always caused by being too cold or too damp. Fix the environment and see an exotics vet for antibiotics.
- Metabolic bone disease — soft jaw, tremors, bent limbs. Prevent it with UVB plus calcium; it's almost entirely a husbandry failure.
- Bad sheds (dysecdysis) — stuck skin, especially on toes and tail tip. Bump humidity briefly and offer a humid hide; never peel skin that isn't ready.
- Mites and parasites — treatable, but get a fecal check from an exotics vet if you see appetite loss or lethargy.
Find a reptile-experienced vet before you need one, and do a yearly check-up.
Enrichment
A bored skink is a lethargic skink. Scatter-feed so they have to forage, rearrange the furniture occasionally, give varied textures (smooth rock, rough bark, deep substrate to dig), and offer supervised floor time in a skink-proofed room. Mental stimulation plus a big, well-furnished enclosure is what keeps them curious and engaged for the long haul.
Get the heat, UVB, dry-but-not-arid humidity, and varied diet right, and a northern blue tongue is about as rewarding as reptile keeping gets — a calm, personable animal that can share your home for two decades.
For why this species is such a strong first reptile, see why northern blue tongue skinks make great pets for beginners, and for one of the best feeder insects to build their diet around, read how to keep discoid roaches alive.