A small, intelligent, dog-tame Australian dwarf monitor often called the ideal first monitor lizard. Active and rewarding, but needs a large enclosure, blazing basking heat, and deep digging substrate.
ℹ️
Educational only. KinStation content is reviewed by licensed veterinarians but cannot replace an in-person exam. Always consult a licensed veterinarian or board-certified specialist for diagnosis, treatment, or any decision affecting your pet's health.
🩺 Need expert help with your ackie monitor?
Connect with a specialist near you or ask a licensed vet — never substitute online guidance for hands-on care in an emergency.
Small monitor; adults about 24-30 in (60-76 cm) total length, much of it tail.
Lifespan
15–20 years
Social needs
solo
Native region
Australia (arid and semi-arid northern and central Australia)
Origin
Old World
Climate
🏜️ Arid
Family
Varanidae
Genus
Varanus
Part of the Monitor lizards
Monitors (genus Varanus) are large, intelligent, powerful Old World lizards with high heat, space, and enrichment needs. Many species reach impressive sizes and are strictly for experienced keepers; some are legally restricted.
From the minimum an animal needs to be kept humanely, up to the ideal setup. Bigger is almost always better — minimums are floors, not targets.
Photo coming soon
Minimum
Adult dwarf monitor enclosure
4 × 2 × 2 ft (≈ 75 gal)
Varanus acanthurus is a small (2 ft) dwarf monitor. Minimum is a 4×2×2 with deep dig substrate (≥ 12 in clay/sand mix), basking surface 60+ °C, 10–12% UVB, low humidity. Active diurnal hunters.
Photo coming soon
Recommended
Larger arid vivarium
6 × 2 × 2 ft with deep substrate
A 6×2×2 with 18 in+ of compactable dig substrate, extensive hardscape, multiple basking heights, and intense UVB. Ackies are powerful tunnelers — substrate depth is the welfare keystone.
Photo coming soon
Ideal
Bioactive Australian arid
8 × 3 × 3 ft, bioactive
Large bioactive central Australian arid enclosure with very deep substrate, massive hardscape, drought-tolerant plants, and full sun-mimicking lighting. Best welfare for one of the smartest pet lizards.
Life & growth stages
How this animal changes through its life — each stage often has its own care, diet and space needs.
Photo coming soon
Egg / Neonate
Most reptiles lay leathery- or hard-shelled eggs incubated by ambient warmth, though some snakes and lizards give live birth. Incubation temperature can influence sex and development in many species.
Photo coming soon
Hatchling
Hatchlings emerge as fully formed miniatures of the adult, often using an egg tooth to slit the shell. They are independent from birth but small and vulnerable, and may show brighter or different juvenile patterning.
Photo coming soon
Juvenile
Juveniles grow steadily, shedding their skin periodically as they enlarge. Coloration and proportions shift toward the adult form, and growth rate depends heavily on temperature, diet, and basking/UVB access.
Adult
Adults reach the species' full length and mass and become sexually mature. Many reptiles show sex differences in size, coloration, or features (such as larger heads, hemipenal bulges, or femoral pores), and continue to shed throughout life.
Color & pattern variants
Natural variants occur in the wild; selectively bred (man-made) variants were developed in captivity.
Despite being a dwarf species, ackies are bold, active monitors that need substantial space; an adult should have a minimum enclosure of about 4 ft x 2 ft x 2 ft (1.2 x 0.6 x 0.6 m), and many keepers go larger or build custom enclosures. Provide 12+ inches of deep, slightly moist mixed substrate (topsoil and sand, or topsoil/sand/clay) so they can construct stable burrows, which are central to their natural behavior and humidity needs.
Ackies need a very hot basking site: a focused surface temperature of 130-150 F (54-66 C) created with a cluster of basking bulbs over a rock or tile stack, a warm ambient around 90-100 F (32-38 C), and a cool retreat in the low 80s F, with a night drop. Surface humidity stays moderate (around 40-60%) while the lower burrow substrate stays cooler and more humid. Provide strong UVB (T5 HO ~10-12%, Ferguson Zone 3) over the basking area, plenty of cover, and a water bowl.
Substrate
Use a deep (12-18 inch / 30-45 cm) layer of substrate that holds humid burrows, such as a sandy-loam soil mix (washed play sand mixed with topsoil/coco fiber at roughly 60/40). Ackies are active burrowers, so depth and the ability to maintain stable tunnels matter more than the exact recipe; mist the lower layers to keep them packable.
Equipment & setup
Provide a high-output basking surface of 130-150 F (54-65 C) using a cluster of halogen flood bulbs over a stone or stacked-rock retreat, with a cooler end around 80 F (27 C) and a strong T5 HO UVB lamp (Arcadia 14% or Zoo Med 10.0) spanning much of the enclosure. House in at least a 4x2x2 ft enclosure (larger is better) and offer ambient humidity around 50-60% with a humid burrow layer.
Diet
Ackie monitors are insectivores and carnivores with fast metabolisms and big appetites. The staple is a variety of gut-loaded insects: dubia roaches, crickets, locusts, hornworms, and similar feeders, supplemented occasionally with whole prey such as appropriately sized pinky/fuzzy rodents and the odd egg. Juveniles eat daily and grow quickly; adults can be fed slightly less often to prevent obesity.
Dust insects with calcium regularly and add a multivitamin periodically. A varied invertebrate base keeps them lean and healthy; whole prey and eggs are best used as occasional supplements rather than the bulk of the diet. Always provide fresh water.
Behavior & temperament
Ackies are intelligent, curious, and among the most personable lizards in the hobby; with consistent gentle handling they often become genuinely tame, recognizing keepers and tolerating interaction well. They are diurnal and highly active, spending the day basking, digging extensive burrows, hunting, and exploring, which makes them engaging display animals and good candidates for enrichment like food puzzles and rearranged decor.
They are generally best kept singly, especially for new keepers; while experienced keepers sometimes maintain pairs or groups in very large, well-resourced enclosures, cohabitation risks competition and stress. A deep dig substrate, a hot basking stack, and ample cover satisfy most of their behavioral needs.
Health
Common problems are husbandry-driven: metabolic bone disease from poor UVB or calcium, obesity from overfeeding rich prey, and respiratory infections when the enclosure is too cool or poorly ventilated. Too-shallow or too-dry substrate prevents proper burrowing and can cause stress, poor sheds, and dehydration; substrate that is constantly wet on the surface invites scale rot.
Prevention relies on a strong thermal gradient with a very hot basking zone, correct UVB, deep workable substrate, and a varied, calcium-dusted insect diet. Routine fecal screening for parasites and an annual exotics-vet check help catch issues early. Lethargy, refusal to bask, or labored breathing warrant prompt veterinary attention.
Tips, DIY & hacks
Pile flat slate or stacked rock/cork directly under the basking lamp so the monitor can thermoregulate by pressing its belly against heat-soaked stone, which mimics wild behavior and aids digestion. Feed a varied insect diet (dubia roaches, crickets, occasional pinkies) and use scatter-feeding or a dig box stocked with insects for foraging enrichment.
