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ReptileTerrestrialIntermediate
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Black-headed Monitor
Varanus tristis
A medium-sized, highly active, and arboreal Australian monitor lizard. It requires large enclosures, robust climbing structures, and very hot basking spots.
Class:Squamata
Order:Squamata
Family:Varanidae
Genus:Varanus
Species:Varanus tristis
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Environment
Terrestrial
Humidity
50 - 60 %
Day temperature
28 - 35 °C
Night temperature
22 - 26 °C
Adult size
30.5 cm
UVB
High
Species description
Geographical Origin and Habitat: Widespread across most of the Australian continent, inhabiting dry woodlands, shrublands, and rocky ranges. It utilizes hollow tree trunks and large branches as shelters.
Taxonomy and Genetics: Belongs to the family Varanidae, genus Varanus, and subgenus Odatria. Two subspecies are recognized: Varanus tristis tristis (darker with a black head) and Varanus tristis orientalis (lighter, freckled monitor).
Behavior and Habits: Diurnal, arboreal, and highly active. It is a shy but curious lizard, capable of climbing vertical trunks with great agility. It displays complex problem-solving abilities and high intelligence.
Morphology: Reaches a total length of 50-80 cm, with the tail being longer than the snout-vent length. Features a slender, strong body, sharp claws, and dark coloration with lighter ocelli. The nominal subspecies has a completely jet-black head.
Care, breeding and tankmates
Terrarium Setup: Needs a large, secure enclosure (minimum 150x60x90 cm). Provide thick branches, hollow cork bark logs, and climbing ledges to maximize vertical space. Use a deep substrate of sand-soil mix to support digging.
Lighting and Heating: Basking spot must reach 45-55°C (113-131°F) using halogen bulbs. Ambient temperatures should be 28-32°C (82-90°F) with a night drop to 20-22°C (68-72°F). High-output 10-12% UVB lighting is required.
Humidity and Hydration: Maintain moderate humidity (35-50%). A humid hide box filled with damp sphagnum moss is essential. Provide a large water dish for drinking and soaking.
Feeding and Supplementation: Carnivorous. Feed insects (roaches, crickets, locusts), egg pieces, and occasional appropriately sized rodents. Dust food with calcium twice a week and multivitamins weekly.
Compatibility: Strictly solitary. Males are territorial and will fight aggressively. Co-habitation of male-female pairs requires vast space and constant monitoring to prevent injuries.
Health and Common Diseases: Metabolic Bone Disease (MBD) can occur without adequate calcium and UVB. Obesity is a common issue in captivity; diets must be carefully regulated. Ensure heat sources are caged to prevent severe burn injuries.
Geographic Origin and Distribution
Widespread across most of the Australian continent, inhabiting dry woodlands, shrublands, and rocky ranges. It utilizes hollow tree trunks and large branches as shelters.
Origin
Cosmopolitan or introducedAustralia, New Guinea, and Oceania
Reptile profile
- Diet
- No verified data available
- Life expectancy
- No verified data available
- Adult size
- 30.5 cm
- Lifestyle/Microhabitat
- No verified data available
- Activity cycle
- No verified data available
- Sociality
- No verified data available
- Reproduction
- No verified data available
- Handling tolerance
- No verified data available
- Brumation
- No verified data available
- Molting
- No verified data available
The catalog's scalar value is 30.5 cm. The ReptTraits v1.2 source reports a maximum adult measurement of 30.5 cm for this species, recorded as snout–vent length (SVL). These figures are not interchangeable: the first is the profile's editorial reference, whereas the second is a published maximum under a specific measurement convention; differences among sources can reflect sex, population, life stage and measuring method.
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
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