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Green Tree Monitor
Varanus prasinus
Encounter the Green Tree Monitor, an active, incredibly intelligent arboreal lizard from New Guinea. Brilliant emerald green with a prehensile tail, it demands a massive, highly humid vertical habitat.
Class:Squamata
Order:Squamata
Family:Varanidae
Genus:Varanus
Species:Varanus prasinus
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Environment
Terrestrial
Humidity
70 - 80 %
Day temperature
26 - 28 °C
Ambient temperature
29 °C
Night temperature
22 - 24 °C
Basking spot
45 °C
Adult size
31 cm
Minimum enclosure
>= 250 L
UVB
High
Species description
Geographical Origin and Habitat: The Green Tree Monitor (Varanus prasinus) is native to the tropical rainforests of New Guinea and several surrounding islands, including the Aru Islands. It is an exclusively arboreal species, inhabiting the warm, humid forest canopy, monsoon forests, and cocoa plantations, rarely descending to the forest floor.
Taxonomy and Genetics: Belonging to the family Varanidae and genus Varanus, it is a member of the Hyracosaura subgenus. It forms the core of the Varanus prasinus species complex, which includes several other closely related color variants and island species. Their genetics are specialized for low-body-weight agility in vertical spaces.
Behavior and Habits: Extremely agile, diurnal, and active, this monitor lizard features a fully prehensile tail used as a fifth limb for climbing and stabilization among thin branches. They are highly intelligent, alert, and possess excellent vision. In captivity, they are active foragers and require mental stimulation.
Morphology: They exhibit a slender, streamlined body shape. Adults reach total lengths of 30 to 40 inches (75-100 cm), with the prehensile tail making up about 60-70% of that length. Their coloration is a brilliant emerald green or turquoise, often with dark chevron-like bands across the back. Clawed feet provide excellent grip.
Care, breeding and tankmates
Terrarium Setup: A vertically oriented enclosure is mandatory. Minimum dimensions for a single monitor or pair should be 5 x 3 x 5 feet (150x80x150 cm). Provide a complex network of climbing branches, cork bark tubes, shelves, and live plants (such as Ficus or Monstera) to create cover. Substrate should be a moisture-retaining mix of topsoil and peat moss.
Lighting and Heating: Establish a vertical thermal gradient. The ambient temperature should range from 80-82 °F (26-28 °C) at the bottom to 90-95 °F (32-35 °C) near the top, with a high basking spot of 104-108 °F (40-42 °C) on an elevated branch. Night temperatures should drop to 72-75 °F (22-24 °C). High-output UVB (6-10%) is essential.
Humidity and Hydration: Maintain high humidity levels between 70% and 80%, with spikes up to 90%. Daily misting or an automatic misting system is required to sustain this. Provide a fresh water dish on a shelf or elevated platform, as they rarely descend to the floor to drink, often preferring to lick water droplets from leaves.
Feeding and Supplementation: Highly active insectivores with a fast metabolism. Feed juveniles daily and adults 3-4 times a week. The diet should consist of gut-loaded crickets, roaches, locusts, and silkworms, with occasional pinky mice or quail eggs as treats. Dust prey with calcium and D3 twice a week, and multivitamins weekly.
Compatibility: Can be kept individually or in small groups (one male and one or two females) in large enclosures. Never house multiple males together, as they will fight aggressively for territory. They are shy and do not tolerate excessive handling, requiring a hands-off approach and slow socialization.
Health and Common Diseases: Prone to Metabolic Bone Disease (MBD) if UVB and calcium are lacking. Respiratory infections can occur if the enclosure lacks proper ventilation while maintaining high humidity. Nose rubbing against screen or glass (causing sores) is a common stress indicator that requires enclosure modifications.
Geographic Origin and Distribution
The Green Tree Monitor (Varanus prasinus) is native to the tropical rainforests of New Guinea and several surrounding islands, including the Aru Islands. It is an exclusively arboreal species, inhabiting the warm, humid forest canopy, monsoon forests, and cocoa plantations, rarely descending to the forest floor.
Origin
North AmericaAfrica and MadagascarAustralia, New Guinea, and Oceania
Reptile profile
- Diet
- No verified data available
- Life expectancy
- No verified data available
- Adult size
- 31 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 31 cm. The ReptTraits v1.2 source reports a maximum adult measurement of 31 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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