What Do Blue Tongue Skinks Eat? A Complete Feeding Guide
I've fed a lot of reptiles over the years, and blue tongue skinks are one of my favorites to cook for — they're enthusiastic, food-motivated omnivores that eat almost like a small dog. That enthusiasm is also the trap: they'll happily eat themselves into obesity or a calcium deficiency if you let them. This guide is the diet I actually feed and recommend, with the real numbers, the safe and unsafe lists, and the supplement math that keeps their bones strong.
Most pet blue tongues in the U.S. are Northern blue tongue skinks (Tiliqua scincoides intermedia), and the principles here apply across the Tiliqua genus, with a couple of species notes where it matters.
Blue tongue skinks are true omnivores
In the wild — across Australia, New Guinea, and parts of Indonesia — blue tongues are opportunistic omnivores. They forage low and slow, eating whatever the season offers: beetles, snails, grasshoppers, worms and other invertebrates, plus flowers, leaves, fallen fruit, and the occasional bit of carrion. They are built to eat both plants and animals, and a captive diet has to honor both halves.
That dual nature is the foundation of everything below. A skink fed only insects gets too much fat and phosphorus; a skink fed only salad misses critical protein. The art is the ratio.
The core ratio: protein, vegetables, fruit
For a healthy adult, the target I use is:
- ~50% vegetables and leafy greens — the bulk of the plate
- ~40% protein — animal-based
- ~10% fruit — a treat, not a staple
This is by rough volume, not by individual meal — you balance it across the week. Younger skinks shift the dial toward protein (more on that in the life-stage section). The reason the ratio matters so much is two specific diseases: too little calcium (or bad calcium-to-phosphorus balance) causes metabolic bone disease (MBD), and too much fat/fruit/overfeeding causes obesity, which shortens lifespan and wrecks mobility. Get the ratio right and you've prevented the two most common diet problems before they start.
Vegetables and greens: the cornerstone
Greens and veg should be the largest part of an adult's diet. Build the base from high-calcium leafy greens, then add color and variety.
Staple leafy greens (feed often):
- Collard greens
- Dandelion greens
- Mustard greens
- Turnip greens
- Endive and escarole
These are the workhorses because they bring fiber, vitamins, and a favorable calcium load.
Good supporting vegetables (rotate in):
- Squash (butternut, acorn, summer squash)
- Bell peppers
- Green beans and snap peas
- Carrots (shredded)
- Sweet potato (in moderation)
Feed sparingly — high oxalate: Spinach, kale, beet greens, and chard aren't toxic, but their oxalates bind calcium and can work against you if they dominate the bowl. A little, occasionally, is fine; as a staple, no.
Always rinse produce to cut pesticide residue, and chop everything into bite-sized pieces. Variety isn't just enrichment — rotating greens smooths out the nutrient profile so no single weakness piles up.
Proteins: the part people get wrong
Here's where the most damage gets done in skink keeping, so read this part twice.
Common feeder insects do NOT have a favorable calcium-to-phosphorus ratio. Crickets, dubia and discoid roaches, mealworms, and superworms are all phosphorus-heavy. If you feed them straight, you're tilting your skink toward calcium deficiency and MBD. The fix is non-negotiable:
- Gut-load feeders for 24-48 hours before feeding (on greens, veg, and a quality gut-load), so the insect itself is more nutritious.
- Dust feeders with calcium powder at feeding time to correct the phosphorus tilt.
Don't trust any blanket claim that a feeder is "naturally balanced." With the partial exception of black soldier fly larvae (which carry more calcium than most), the staple feeders all need dusting. Treat dusting as part of the meal, not an optional extra.
Good protein sources:
- Feeder insects (gut-loaded + dusted): discoid or dubia roaches make an excellent staple — meaty, easy to keep, and readily eaten. I keep a roach colony going specifically for this; you can pick up a starter culture of discoid roaches from All Angles Creatures. (If you keep roaches yourself, see my discoid roach keeping guide.)
- Snails (captive-raised or canned, rinsed): a natural, calcium-bearing favorite thanks to the shell.
- Lean cooked meats: unseasoned chicken or turkey, lean ground beef occasionally — small, manageable pieces.
- Eggs: scrambled or boiled, in moderation; rich and very digestible.
- Occasional, higher-fat feeders as treats only: waxworms, superworms, hornworms — great for tempting a picky eater or adding moisture, but not staples.
On dog/cat food: a small amount of high-quality, low-fat wet dog food can fill in as an occasional protein, but it's usually too fatty and salty to lean on. Keep it rare.
A note on a stubborn myth: the goal across the whole diet is a calcium-to-phosphorus ratio around 2:1 in calcium's favor. You don't reach that by hoping your feeders are balanced — you reach it with high-calcium greens, calcium dusting, and proper supplementation. The supplement does the correcting; the feeder doesn't.
Fruit: the 10% treat
Fruit is candy. Skinks love it, it delivers antioxidants and moisture, and it should stay at roughly 10% of the diet.
Good choices (small amounts): blueberries, strawberries, raspberries, mango, papaya, melon, chopped apple and pear (seeds removed).
Go easy: bananas — popular but low in calcium relative to phosphorus, so an occasional treat at most.
Avoid: citrus (too acidic; digestive upset).
Overdoing fruit is one of the fastest routes to a fat skink and an upset gut, so weigh it as a garnish, not a course.
Treats and enrichment
Treats do double duty: enrichment and trust-building. A wriggling dusted insect, a slice of mango, or a piece of boiled egg by hand turns mealtime into a bonding routine — blue tongues genuinely seem to recognize and anticipate their keeper at feeding time. Keep treats to once or twice a week, never more than 10% of total intake, and use them to encourage natural foraging (scatter-feed, hand-feed, hide a snail) rather than just dumping a bowl.
Toxic and unsafe foods — the hard "never" list
Some of these are mildly unsafe; some are lethal. Know all of them.
- Avocado — contains persin; can be fatal. Never.
- Rhubarb — toxic oxalate levels. Never.
- Onion and garlic — damage red blood cells. Avoid.
- Citrus — too acidic; digestive upset.
- Chocolate and caffeine — theobromine; toxic. Never.
- Fireflies/lightning bugs — lucibufagins are lethal to reptiles. Never, under any circumstances.
- Any wild-caught insects — pesticide and contaminant risk. Don't.
- Processed human food — salty, sugary, fatty snacks cause obesity and organ stress.
- High-oxalate greens as staples — spinach, kale, beet greens (occasional only).
When in doubt, leave it out. A missed nutrient is recoverable; a toxic dose may not be.
Supplements: calcium, D3, and multivitamin
This is the safety net that prevents MBD, and it's simple once you set the routine.
- Calcium: dust feeders/meals with a reptile calcium powder at most feedings. Whether you use calcium with D3 depends on your lighting.
- Vitamin D3: D3 enables calcium absorption. If your skink has strong UVB lighting, it can make much of its own D3, so use plain calcium most of the time and a D3 calcium occasionally. If UVB is weak or absent, use calcium-with-D3 more regularly. Don't skip UVB and lean entirely on oral D3 if you can avoid it — proper UVB is part of the system.
- Multivitamin: a reptile multivitamin lightly, about once a week. Over-supplementing fat-soluble vitamins (A, D, E, K) can cause toxicity, so "lightly" is the operative word.
The Merck/MSD Veterinary Manual's reptile nutrition overview is a solid non-commercial reference on why calcium balance and D3 matter, and what deficiency looks like. The short version: calcium + D3 + UVB together build bone; miss one leg of that tripod and you risk MBD.
Feeding schedules and portions by life stage
Portion rule of thumb: a meal roughly the size of the skink's head. Frequency changes a lot with age.
Hatchlings and juveniles (0-6 months)
- Frequency: daily (or every other day at minimum)
- Ratio: protein-forward — closer to 50-60% protein, with greens and a little fruit
- Why: they're growing fast and building bone and muscle; they need fuel and calcium constantly
- Prep: dice everything small; dust insects with calcium
Sub-adults (6-12 months)
- Frequency: every 2-3 days
- Ratio: transitioning — dial protein down, greens up
- Portion: ~1.5× head size as they bulk out
Adults (12+ months)
- Frequency: about twice a week
- Ratio: the standard 50% veg / 40% protein / 10% fruit
- Watch: body condition. Adults obese easily — if the skink is getting wide and soft, cut frequency and fat.
Seniors
Older skinks slow down. Trim protein further, raise fiber (more veg), keep calcium balance dialed in for aging bones, offer softer foods (cooked squash, moistened protein), and feed a bit less often. Let body condition and appetite guide you.
| Life stage | Frequency | Approx. ratio | Notes |
|---|---|---|---|
| Hatchling/juvenile (0-6 mo) | Daily / every other day | ~55% protein, rest veg+fruit | Fast growth; dust every meal |
| Sub-adult (6-12 mo) | Every 2-3 days | Shifting toward balance | Slightly larger portions |
| Adult (12 mo+) | ~2× per week | 50% veg / 40% protein / 10% fruit | Watch for obesity |
| Senior | Slightly less often | Lower protein, higher fiber | Softer, easier-to-digest foods |
Reading your skink's signals
Blue tongues have opinions. A skink that nudges food aside or ignores it is telling you something; one that lunges and munches approves. Watch for:
- Texture preferences — some love crunchy greens, some want softer pieces.
- Temperature — food that's fridge-cold is often refused; room-temp or slightly warm gets a better response.
- Seasonal swings — appetite can dip and surge; a temporary slowdown isn't always a problem.
Rotate offerings and pay attention. Persistent refusal, weight loss, or lethargy is a vet conversation, not a "they're just picky" conversation.
Meal prep and storage
You can batch this like meal-prepping for yourself:
- Cook proteins in batches (lean chicken, eggs, snails) and refrigerate; most keep 3-4 days, or freeze pre-portioned and thaw overnight.
- Chop produce and store greens wrapped in a damp paper towel to stay crisp; keep fruit separate so it doesn't speed spoilage.
- Portion by volume (a kitchen scale or eyeball to head-size) so the 50/40/10 ratio holds.
- Label and date containers; toss anything questionable.
A weekly prep session makes consistent, balanced feeding realistic on a busy schedule — and consistency is half the battle.
Common diet problems and how to prevent them
- Obesity — from overfeeding, too much fat (waxworms, fatty meat, dog food), or too much fruit. Prevention: stick to the schedule, weigh periodically, keep treats at 10%.
- Metabolic bone disease (MBD) — from low calcium, bad Ca:P, or no D3/UVB. Prevention: dust, gut-load, supplement, and run proper UVB. This is the big one, and it's almost entirely preventable.
- Vitamin imbalance — from a monotonous diet or over-supplementing. Prevention: variety plus a light weekly multivitamin.
- Impaction — from hard-to-digest food or ingesting loose substrate. Prevention: appropriately sized soft food and a safe substrate (avoid loose particulate for skinks prone to mouthing it).
The bottom line
Feed your blue tongue skink like the omnivore it is: a base of high-calcium greens, solid gut-loaded and dusted protein, a little fruit, and a disciplined supplement routine backed by good UVB. Match frequency and ratio to age, watch body condition, and keep the toxic list memorized. Do that and you'll have a chunky-in-a-good-way, bright-eyed skink that comes running at the rustle of the food container for years.
For more on the feeders behind a good skink diet, see my discoid roach keeping guide and my buffalo beetle / lesser mealworm guide, or browse the full exotic animals library.