Blue Tongue Skink Breeding: Sexing, Pairing, and Live Birth

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Blue tongue skink breeding starts with a fact that surprises a lot of new keepers. There are no eggs to incubate. These lizards are live bearers, and the process looks more like preparing a small mammal for a litter than setting up an incubator.

Getting it right means understanding sexing, conditioning, pairing, and what a newborn skink actually needs. This guide covers the full process for the common pet species, Tiliqua scincoides, with notes on the northern subspecies many US keepers work with. It is written for someone who already keeps a healthy adult skink, not as an invitation to breed for quick sale.

For the basics of daily husbandry, see our blue tongue skink care guide.

Do blue tongue skinks lay eggs or give live birth?

Blue tongue skinks do not lay eggs. They are ovoviviparous. The eggs stay inside the mother without a hard shell, and the babies are nourished through a placenta like structure until birth.

So do blue tongue skinks give live birth? Yes, and it is one of the defining traits of the whole Tiliqua group. You will never find a clutch to candle or an incubator setting to look up.

A pregnant female instead needs steady warmth, food, and calcium right through to delivery. Think of her care more like a pregnant gecko carrying live young than a female laying a shelled clutch.

Should you breed your blue tongue skinks?

Breeding takes real commitment. A single litter can produce five to twenty five babies. Each one needs its own enclosure, food, and eventually a responsible home.

Before starting, think through where every baby will go. Consider whether you can run a dozen or more small setups at once. Confirm that your pair is genuinely healthy enough for the strain of pregnancy.

Skinks that are underweight, under two years old, or recovering from illness should not be paired. Wild eastern blue tongues reach sexual maturity at about 19 months. A captive female should be fully grown and well past that point.

Breeding stresses a female’s body. A poorly conditioned skink is far more likely to have a difficult or fatal delivery.

Sexing blue tongue skinks

Visual sexing is unreliable. Animal Diversity Web records the sexes as alike, with no clear external difference between males and females. The San Diego Zoo Wildlife Alliance fact sheet notes only subtle differences in some wild populations: adult males have a slightly wider head, and females run slightly longer in the body.

Keepers build on that head shape cue and also look for a slight hemipenal bulge at the base of the tail. The differences are small and overlap between individuals, and no veterinary source confirms the bulge check for this species. Treat these cues as a guess, not a result.

The reliable route is a reptile veterinarian experienced with skinks. A vet can confirm sex before you commit to a pairing, and a wrong guess wastes a whole breeding season. Do not attempt to probe or evert hemipenes yourself, since rough handling can injure the animal.

Blue tongue skink breeding calendar

Wild eastern blue tongues follow a fixed annual cycle. The Australian Museum records males pursuing females from September to November and births from December to April. The San Diego Zoo Wildlife Alliance gives mating from August to October and most births from December to February.

Captive keepers in the northern hemisphere shift that cycle by six months. The table below shows the usual sequence.

Brumation and conditioning before pairing

Do blue tongue skinks brumate? In the wild, yes. Eastern blue tongues in temperate southeastern Australia go dormant through winter, and the annual breeding cycle above starts as they emerge.

A healthy pet skink kept warm year round can live a full life without ever brumating. Cooling is a breeding tool, not a welfare requirement.

No veterinary or zoo source publishes a cooling protocol for this species. Long standing hobby practice is a gradual drop over two to three weeks.

Days end up in the high 60s°F, nights around 60 to 65°F, with an 8 to 10 hour photoperiod. Most breeders hold that for four to eight weeks with the basking lamp, such as a Zoo Med Repti Halogen Basking Spot Lamp, off and no food.

Do northern blue tongue skinks brumate the same way? Not usually.

The northern subspecies comes from tropical northern Australia, where winter is a warm dry season rather than a cold one. The San Diego Zoo Wildlife Alliance notes that breeding follows the dry season.

Northern lines are usually cycled with a gentler dip. Nights go to the high 60s and days to the mid 70s, with the shorter photoperiod. Watch the individual animal rather than forcing a deep brumation.

Only condition an animal that is at a healthy weight, with the gut cleared by a two week fast at normal temperatures first. Keep water available throughout and weigh the skink weekly. Warm the enclosure back up gradually afterward rather than all at once.

A skink that loses more than about 10 percent of its body weight, or stops responding normally, needs warming up and a vet check right away.

Pairing and introducing skinks

Blue tongue skinks are solitary by nature, and aggression between captive males is well documented. They do not tolerate cohabitation outside a deliberate, supervised breeding introduction. The safest approach is bringing the female into the male’s enclosure, or a neutral space, for short supervised sessions.

Normal courtship is not gentle. The Australian Museum describes mating as rough, with males pursuing females and females carrying scrape marks from the male’s teeth. A male that follows the female, nudges her flanks, and grips her side or neck with his jaws is courting, not fighting.

Watch closely for the defensive display these skinks are known for. A gaping mouth, an extended blue tongue, hissing, and an inflated body are the classic warning signs. They mean the female is not receptive that day.

A locked bite, repeated lunging, or an animal trying to flee and being cornered is different. That pairing should be separated at once. Successful introductions are often brief, sometimes lasting only minutes once the pair is receptive.

Reintroduce over a few days around the expected breeding window. Do not leave the animals together long term and hope for the best.

Gestation, litter size, and birth

Once a female has bred successfully, expect a gestation of about three to four months. That figure comes from the San Diego Zoo Wildlife Alliance fact sheet on the eastern blue tongued skink.

It records wild mating from August to October and births from December to February. Those are late winter to spring and early to late summer in Australia.

Individual females vary by a few weeks either way. Birth itself takes about one and a half to eight hours, during the day, after the female has warmed her body.

Litter size for the common eastern and northern subspecies is usually reported in the range of five to twenty five live young. Most wild litters hold 10 or 11, and litter size increases with the female’s age and body size. A pregnant female should get extra calcium and slightly more frequent feedings, since she is supporting a large litter internally.

Late in gestation the female grows visibly wide behind the front legs and basks for longer. She often refuses food in the final two or three weeks. That is normal.

A female that strains, becomes lethargic, or passes one or two young and then stops for a day needs a reptile vet. Retained young are a genuine emergency.

Newborns arrive fully formed at roughly five inches long and about half an ounce. The Australian Museum gives 130 to 140 mm total length and 10 to 20 g. Snout to vent length runs 3.5 to 5.1 inches in wild litters.

Each baby eats its own placental membranes within minutes of birth. It sheds for the first time within a few days and is independent from the start.

Remove the mother to her own enclosure once birth is complete. She needs recovery time, and the babies need a low stress setup of their own.

Caring for a baby blue tongue skink

A baby blue tongue skink needs its own small enclosure with the same basic UVB and heat setup as an adult, just scaled down. It also needs secure hides and easy access to food and water. Crowding several neonates into one tub invites competition, stress, and occasional tail or toe injuries from siblings.

Feed baby skinks daily, starting the day after the first shed if they have not taken food before. Offer small feeder insects like appropriately sized crickets alongside finely chopped greens and vegetables, dusted with calcium at most feedings. See our blue tongue skink diet guide for the full feeding breakdown by age.

Growth is fast in the first year. With steady feeding and proper heating and UVB, juveniles in managed care can reach near adult size in about a year. Wild animals take about three years to reach adult size at roughly 400 mm.

Watch for stuck shed around the toes and tail tip, which is common in fast growing juveniles and easy to miss.

What to feed breeding and growing skinks

What veggies can blue tongue skinks eat during breeding season and beyond? Collard greens, dandelion greens, escarole, and turnips cover much of the plant side of the diet. A mix of squash, carrots, parsnips, and beans rounds it out, and plant matter should make up roughly half of what an adult eats.

A pregnant or recovering female benefits from consistent access to this variety rather than a narrow rotation. Can blue tongue skinks eat eggs? A small amount of well cooked egg can be offered occasionally as a protein source, similar to other animal proteins in the diet.

Can blue tongue skinks eat raw eggs specifically? Raw egg carries a real salmonella risk for both the skink and the keeper handling it. Raw egg white can also interfere with biotin absorption.

Cooked egg without shell is the safer choice if you want to offer it at all.

See our full care guide and housing guide for how diet fits into the bigger husbandry picture.

How to breed blue tongue skinks: a short summary

Breeding northern blue tongue skinks and their eastern relatives follows the same basic sequence. Confirm sex and health with a vet first. Condition both animals to a healthy weight, optionally run a winter cooling cycle, then introduce the pair briefly and repeatedly.

The northern blue tongue skink breeding season for most captive setups typically falls in late winter into spring. Watch for weight gain and behavior changes in the female over the following weeks as early pregnancy signs. Prepare a separate nursery setup well before the expected birth window.

Review our notes on typical blue tongue skink behavior so you can tell normal defensiveness from a genuine problem during pairing. Brumation response varies between individual skinks and bloodlines.

Keep records of pairing dates, weight, and behavior for your own animals. That record becomes far more useful for predicting your next litter than any single published average. Check on general health with our blue tongue skink health guide before and after breeding.

Frequently Asked Questions

Do blue tongue skinks lay eggs?

No. Blue tongue skinks are live bearers, and the eggs develop and hatch inside the mother before birth. You will never see a clutch to incubate with this species.

Do blue tongue skinks give live birth to fully formed babies?

Yes. Newborns are about five inches long and eat their placental membranes right after birth. They shed within a few days and are independent from the start, with no incubation period.

Do northern blue tongue skinks brumate?

Not deeply. Northern blue tongues come from tropical northern Australia, where winter is a warm dry season. Most breeders cycle them with a gentle dip to days in the mid 70s and nights in the high 60s for a few weeks, while eastern blue tongues take a deeper, cooler brumation.

What veggies can blue tongue skinks eat?

Collard greens, dandelion greens, escarole, turnips, squash, carrots, parsnips, and beans are all commonly offered. Together they form roughly half of a balanced adult diet alongside animal protein.

Can blue tongue skinks eat raw eggs?

It is safer to avoid raw egg because of salmonella risk and its effect on biotin absorption. A small amount of well cooked egg is a reasonable occasional treat instead.

How long is a blue tongue skink pregnant before giving birth?

Gestation runs about three to four months, according to the San Diego Zoo Wildlife Alliance fact sheet on the eastern blue tongued skink. Wild females mate in late winter and spring and give birth in summer. Captive pairs on a cooling cycle follow a similar rhythm six months shifted.