Northern Blue Tongue Skink Diet

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The northern blue tongue skink (Tiliqua scincoides intermedia) is a large, ground dwelling omnivore. It is native to Queensland and northwestern Western Australia. A northern blue tongue skink diet balances plant matter, animal protein, and calcium.

This guide goes deeper than the general blue tongue skink diet guide. It focuses only on intermedia and notes where a close relative’s data is used for context.

Owners comparing subspecies can also check the Indonesian blue tongued skink profile for how diet needs shift across the genus.

What Northern Blue Tongue Skinks Eat in the Wild

In its native range across northern Australia, this skink forages on the ground during the day. Smithsonian’s National Zoo lists insects, snails, carrion, fruit, berries, flowers, and leaves. The same page notes that the tongue is coated in thick mucus that helps it catch prey, and that fat stored in the tail carries it through drought.

The related eastern blue tongue skink is documented as a slow prey specialist. The Australian Museum describes large teeth and strong jaw muscles that crush snail shells and beetles, and a diet of beetles, caterpillars, crickets, and small lizards. The northern shares that jaw build, so snails and hard bodied insects suit it too.

A captive northern blue tongue skink diet should mirror the wild mix, mostly plant matter with protein filling the gaps.

Matching a wild feeding pattern this closely keeps the animal’s gut and metabolism working the way they evolved to. It also lowers the odds of obesity, a common problem discussed later in this guide.

What Do Northern Blue Tongue Skinks Eat in Captivity

A properly built northern blue tongue skink diet has three parts. These are vegetables and greens, an animal protein source, and occasional fruit. Vegetables should make up the largest share of every meal.

Mustard greens, kale, dandelion greens, and collard greens form a good base. Mix in other vegetables for variety and to avoid relying on any single plant.

Rotating vegetables rather than repeating the same two or three keeps nutrient intake more complete. A mix of leafy greens, squash, bell pepper, and green beans works well alongside the core greens listed above.

Protein can come from gut loaded crickets, mealworms, kingworms, snails, earthworms, and occasional pinky mice for adults. Zoo diets for this subspecies also use leafy greens, mixed vegetables, crickets, and earthworms. Fruit and flowers work best as a small treat, not a daily staple.

Quality commercial dog food or lean cooked meat is sometimes used species wide as an occasional protein supplement. It should never replace whole prey items and gut loaded insects as the main protein source.

Northern Blue Tongue Skink Food Ratios by Weight

LafeberVet’s husbandry sheet for this subspecies sets greens at roughly 45 to 60 percent of the diet. The remainder splits between animal protein and a small fruit allowance. The Merck Veterinary Manual’s reptile nutrition chapter caps fruit at 5 percent of an omnivore’s diet, so keep that slice thin.

The same Merck chapter gives omnivorous reptiles 20 to 25 percent protein and 3 to 6 percent fat on a dry matter basis. It also sizes daily intake at 1 to 4 percent of body weight. The table below shows a simple meal template.

This ratio matters because feeder insects are not naturally rich in calcium. Crickets run about 55 percent protein, with a calcium to phosphorus ratio near 0.3 to 1. Mealworms run about 53 percent protein, with a much lower ratio near 0.1 to 1.

Both insects need calcium dusting before every feeding to correct that imbalance. Snails and earthworms carry more usable calcium on their own. Keepers rotate them into the protein portion rather than relying only on crickets and mealworms.

Northern Blue Tongue Skink Feeding Schedule

Adult northern blue tongue skinks are typically fed every 1 to 2 days rather than daily. Juveniles need more frequent meals than adults because they grow quickly. Some reach adult size in under a year when food is plentiful.

An exact juvenile feeding interval is not set by veterinary sources. Keepers commonly feed young skinks daily to every other day as a working standard until growth slows.

Feeding tongs make it easier to control portions. They also stop live prey from hiding in a corner of the enclosure. A sturdy pair works at any life stage listed above.

Calcium and Vitamin Supplements

Calcium supplementation is not optional for a northern blue tongue skink diet. The Merck Veterinary Manual describes calcium or vitamin D3 deficiency, usually from poor lighting and low calcium diets, as the direct cause of secondary nutritional hyperparathyroidism. That disease is the most common bone problem seen in reptile practice.

LafeberVet’s sheet for this subspecies gives a calcium supplement once weekly and a general vitamin and mineral supplement once weekly. It sets a minimum calcium to phosphorus ratio of 2:1 for the whole diet. Merck’s nutrition chapter agrees, calling 1:1 the floor and 2:1 preferred.

Many keepers dust insects more often than weekly, because crickets and mealworms fall so far below that ratio. A common approach is a plain calcium powder without added D3 on most insect feedings. Skinks under adequate UVB lighting make their own vitamin D3.

Merck adds that insects should get a feed with at least 8 to 10 percent calcium for 72 hours before they are offered. A calcium powder with D3 once a week covers animals whose UVB exposure is not perfectly consistent. Merck puts dietary vitamin D3 at 500 to 1,000 IU per kilogram of food when UVB is lacking.

A reptile multivitamin supplement once weekly, per LafeberVet, covers micronutrients that produce and insects can miss. Vegetable portions should favor a high calcium to phosphorus ratio. Merck also recommends low oxalate vegetables to reduce the risk of kidney stones.

Safe and Unsafe Foods Table

Most fresh vegetables and the protein sources listed above suit a northern blue tongue skink diet well. A short list of foods is best avoided or limited. The reasons range from toxicity risk to interference with calcium absorption.

Obesity and Portion Control

LafeberVet lists obesity, metabolic bone disease, and wasting as the common husbandry problems in this subspecies. Overfeeding protein and fruit is the usual driver of excess weight. A rounded midsection, reduced activity, and reluctance to move are practical warning signs.

Keeping the vegetable portion at or above the 45 to 60 percent target helps prevent overfeeding. Limiting fruit to a small treat, not a daily item, matters too. So does holding to the every 1 to 2 day adult feeding interval.

A large water bowl doubles as an occasional soak that supports digestion and shedding. It adds no calories, unlike extra fruit or protein. Weighing the animal periodically beats judging weight by appearance alone.

Captive skinks can look adequately fed well before they cross into overweight. A simple monthly weigh in, logged over time, catches a slow weight gain early.

Heat, Digestion, and Related Reading

Food only works if the skink can digest it. LafeberVet gives this subspecies a basking spot of 92 to 100 degrees Fahrenheit and a cool end of 70 to 85. A skink kept below that range slows down and may refuse food, so check the enclosure setup guide before blaming the menu.

The related eastern blue tongue skink is fed differently. It comes from a cooler, seasonal climate and eats far less through winter, so its keepers feed adults only a few times a week. The northern, from the tropics, keeps eating year round on the every 1 to 2 day schedule above.

Feeder insect species and sizing are covered in the feeder insects guide. The gut loading guide explains how to raise an insect’s calcium content in the 72 hours before feeding.

For housing, temperature, and health beyond diet, see the main northern blue tongue skink guide. The care guide ties feeding into the daily routine.

Frequently Asked Questions

What is the ideal northern blue tongue skink diet ratio?

Aim for roughly 45 to 60 percent vegetables and greens, the figure in LafeberVet’s sheet for this subspecies. Split the remainder between gut loaded animal protein and a small fruit allowance. Keep fruit under 5 percent of the total.

What do northern blue tongue skinks eat besides insects?

Beyond crickets and mealworms, they eat snails, earthworms, and occasional pinky mice as adults. They also eat leafy greens, mixed vegetables, and small amounts of fruit or flowers. Wild individuals scavenge carrion and eat berries and leaves too.

How often should I feed an adult northern blue tongue skink?

Veterinary guidance for this subspecies recommends feeding adults every 1 to 2 days rather than daily. Juveniles are typically fed more often to support faster early growth.

Do northern blue tongue skinks need calcium supplements?

Yes. LafeberVet gives this subspecies a calcium supplement once weekly and a vitamin and mineral supplement once weekly, with dietary calcium to phosphorus of at least 2:1. Together with UVB, that prevents secondary nutritional hyperparathyroidism, the most common bone disease seen in reptile practice.

Can northern blue tongue skinks eat dog food?

A small amount of quality dog food works as an occasional protein supplement species wide. It should not replace gut loaded insects and fresh produce as the core of the diet. Treat it as a supplement, not a staple.

What foods are toxic to a northern blue tongue skink?

Avocado and members of the onion family are toxic and should never be offered. Snail and slug baits are also dangerous. These skinks can be poisoned by eating treated snails or the bait itself.