Is my blue-tongue skink brumating?
A blue-tongue skink that slows down over the cooler months, hiding more, becoming sluggish, and eating little or nothing, is often simply brumating, and in a healthy adult that's holding its weight this is normal. The key is telling a natural seasonal dip from illness, which comes down to the weight trend and whether the basking spot is actually working.
What brumation looks like
Brumation is a reptile's version of a winter slow-down. In autumn and winter, cooling temperatures and shorter days can prompt a blue-tongue to spend far more time hidden or buried, move sluggishly, bask less, and eat little or nothing for weeks. In an otherwise-healthy adult whose weight holds steady, this is a normal seasonal rhythm rather than a problem, the skink is idling, not declining.
Telling brumation from illness
The difference is in the weight trend and the company the slow-down keeps. A brumating skink holds its weight and shows no other symptoms, it's just quiet. A skink that's unwell tends to lose weight steadily and pairs the lethargy with warning signs like sunken eyes, laboured or wheezy breathing, mucus around the mouth, or abnormal stool. Weigh regularly through the cooler months: stable weight with no other symptoms points to brumation, while a downward trend points to something that needs checking.
Check the basking spot before assuming brumation
The most important thing to rule out is a failed warm end masquerading as brumation, because a cold skink and a brumating skink look alike. Before you settle on brumation, confirm the basking surface actually holds around 35–40°C (95–104°F), measured at basking height with a digital probe rather than a stick-on dial, and that the thermostat hasn't slipped and the bulb hasn't aged. A skink that's sluggish and off its food because its heat has quietly failed needs the heat fixed, not left to 'brumate'.
How to support a brumating skink
If the basking spot is right and a healthy adult is genuinely slowing down, the main thing is not to fight it. Don't force-feed a skink that's turned food down for the season, it isn't digesting well at reduced activity and force-feeding risks a regurgitation. Keep clean water available, leave it undisturbed with minimal handling, and keep weighing it so you'd catch any real weight loss early. Note that juveniles shouldn't really brumate, a young, growing skink that goes sluggish and off its food is more likely to have a husbandry or health problem, so check the setup and weight rather than assuming a seasonal dip.
When to see a vet
See an exotics vet if a skink you assumed was brumating is losing weight, or if the slow-down comes with sunken eyes, laboured or wheezy breathing, mucus around the mouth, or abnormal stool, and treat a sluggish, off-food juvenile as a problem to investigate rather than normal brumation, since the young shouldn't really brumate.
One reading rarely tells the story. What matters is whether it's an isolated blip or part of a trend, so look at recent weight, feeding intervals, shedding, temperature and behaviour together.
baskr keeps those records in one place and watches the pattern for you, so you can see whether something has genuinely changed with your blue-tongue skink, before it becomes a problem.
Track my blue-tongue skink freeRelated questions
How do I know if my blue-tongue skink is brumating or ill?+
A brumating skink holds its weight and simply slows down, while an ill one tends to lose weight steadily alongside signs like sunken eyes, wheezy breathing or abnormal stool. Weigh regularly, stable weight with no other symptoms points to brumation.
Should I feed my blue-tongue skink during brumation?+
Don't force it. Offer water and leave food available, but a skink that's turned food down for the season won't digest well at reduced activity, and force-feeding risks a regurgitation. Keep weighing it so you'd catch any real weight loss.
Do juvenile blue-tongue skinks brumate?+
Not really, young, growing skinks generally shouldn't brumate. A sluggish, off-food juvenile is more likely to have a husbandry or health issue, so check the basking spot and weight rather than assuming a seasonal slow-down.
How long does blue-tongue skink brumation last?+
A seasonal slow-down can run for several weeks through the cooler months, with the skink eating little or nothing. It's normal in a healthy, weight-holding adult, but confirm the basking spot holds 35–40°C (95–104°F) first, so you're not mistaking a failed heat source for brumation.
baskr provides husbandry guidance, not veterinary advice. For anything involving weight loss, injury or illness, always verify with an experienced keeper or an exotics vet.