Encyclopaedia
ReptileTerrestrialExpert
©AI Generated·Proprietary
Spotted tree monitor
Varanus scalaris
An arboreal spotted tree monitor from Australia. It requires a 100x60x120 cm vertical terrarium filled with hollow cork tubes and climbing branches. High ambient heat, UVB, and insectivorous diets are essential.
Class:Squamata
Order:Squamata
Family:Varanidae
Genus:Varanus
Species:Varanus scalaris
Share
Check out Spotted tree monitor on Atlarium
Environment
Terrestrial
Humidity
70 - 80 %
Day temperature
28 - 32 °C
Night temperature
24 - 26 °C
Adult size
26.8 cm
UVB
Medium - High
Species description
Geographical Origin and Habitat: Varanus scalaris, commonly known as the spotted tree monitor, is native to northern Australia and the southern regions of Papua New Guinea. It primarily inhabits open eucalyptus forests, wooded savannas, and tropical to subtropical woodlands. This species leads a highly arboreal lifestyle, spending most of its time climbing tree trunks or seeking refuge under loose bark and within natural tree hollows, which provide protection from predators and stable microclimates.
Taxonomy and Genetics: It belongs to the class Reptilia, order Squamata, family Varanidae, and genus Varanus. Within the genus Varanus, it is classified under the subgenus Odatria, which comprises the dwarf monitors of Australia. Several local populations display slight genetic and pattern variations, leading some taxonomists to consider certain variants as distinct subspecies or separate species within the Varanus scalaris complex.
Behavior and Habits: This reptile is diurnal, extremely active, agile, and intelligent. It has a vigilant and initially shy temperament toward humans, but it can adapt to the keeper's presence with patient and consistent management. It spends its days exploring branches within its territory in search of prey. It utilizes its long, prehensile tail as a balance weight when leaping between branches and its clawed limbs to scale vertical surfaces with extraordinary ease.
Morphology: It is a small-to-medium-sized monitor species, with an adult total length typically ranging between 45 and 60 centimeters, of which more than half is comprised of the tail. The body is slender and elongated, and the head is pointed with large, alert eyes. Its pattern features a dark grey, brown, or blackish base coloration covered with a dense array of small yellow or cream spots or ocelli, arranged in transverse rows that create a protective mottled appearance.
Care, breeding and tankmates
Terrarium Setup: It requires a large, vertically oriented terrarium. The minimum recommended dimensions for a single specimen are 100x60x120h cm. The interior must feature numerous sturdy branches of varying diameters arranged diagonally and vertically, cork bark tubes, and slate stacks to provide climbing opportunities and hiding places at different heights. The substrate on the bottom should consist of a draining mixture of coconut fiber, peat, and orchid bark, kept slightly damp. Providing hiding spots in both the warm and cool zones of the enclosure is crucial.
Lighting and Heating: Providing a thermal gradient and high-quality UVB lighting (T5 neon tubes with 10% or 12% UVB output) is indispensable to prevent metabolic bone disease. The day-night cycle should be set to 12 hours. Ambient temperatures during the day must range from 28°C in the cool area to 32°C in the warm area, with a localized basking spot (under a heating spot lamp) reaching 45-50°C. At night, temperatures can safely drop to 20-22°C without requiring additional heating.
Humidity and Hydration: Relative humidity inside the terrarium should be maintained between 60% and 80% to assist with shedding and maintain proper hydration. This can be achieved by misting the terrarium once or twice daily with lukewarm water or installing an automatic misting system. It is important to let the enclosure dry out slightly between mistings to prevent stagnant dampness. A shallow bowl filled with fresh, clean water must always be available in the cool zone.
Feeding and Supplementation: This species is primarily insectivorous in the wild, but it accepts a wide variety of prey items in captivity. The diet should be based on active live insects such as crickets, roaches (Dubia or lateral), locusts, mealworms, and occasionally superworms or silkworms. Adults can sporadically be fed small rodents (thawed mice pinkies or fuzzies) or quail eggs. It is crucial to dust prey with pure calcium at every feeding for juveniles and 2-3 times a week for adults, adding calcium with vitamin D3 and a multivitamin once a week.
Compatibility: It is a solitary species that exhibits strong territoriality, especially among males. Co-habitation of multiple specimens in the same enclosure is highly discouraged and should only be attempted by experienced keepers in massive enclosures, while closely monitoring for signs of aggressive or submissive behaviors. Under no circumstances should it be housed with other reptile or amphibian species, as they would be preyed upon or attacked.
Health and Common Diseases: The most common health issues include Metabolic Bone Disease (MBD), caused by insufficient UVB exposure or lack of dietary calcium, presenting as tremors, bone deformities, and lethargy. Other risks include respiratory infections due to low temperatures combined with excess humidity, and dehydration if clean drinking water is not constantly accessible. Regular fecal examinations by a specialized veterinarian should be performed to monitor for internal parasites.
Geographic Origin and Distribution
Varanus scalaris, commonly known as the spotted tree monitor, is native to northern Australia and the southern regions of Papua New Guinea. It primarily inhabits open eucalyptus forests, wooded savannas, and tropical to subtropical woodlands. This species leads a highly arboreal lifestyle, spending most of its time climbing tree trunks or seeking refuge under loose bark and within natural tree hollows, which provide protection from predators and stable microclimates.
Origin
Africa and MadagascarAustralia, New Guinea, and Oceania
Reptile profile
- Diet
- No verified data available
- Life expectancy
- No verified data available
- Adult size
- 26.8 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 26.8 cm. The ReptTraits v1.2 source reports a maximum adult measurement of 26.8 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.
Related species
Recommendations grouped by close relatives, companion choices, and similar care.
