Blue tree monitor — Care Sheet & Morphs

Q: How big does an adult Blue tree monitor get?

An adult Blue tree monitor typically measures 0.9–1.1 m.

Husbandry requirements

Blue tree monitor — origin: Endemic to Batanta Island, Raja Ampat archipelago (West Papua, Indonesia). Humid tropical rainforest. Very restricted range..

Terrarium temperature gradient

Night min23 °C

Cool side26–28 °C

Warm side30–33 °C

Basking spot48–55 °C

A heliophilic species that requires a genuine localized hot spot: the surface temperature at the basking spot can reach 50–60 °C (use spotlights/halogens protected by an anti-burn guard). Maintain a strong horizontal AND vertical thermal gradient. A beneficial nighttime drop down to 23–25 °C.

Enclosure (adult)

150 × 90 × 180 cm

Large vertical arboreal terrarium, ideally bioactive and heavily planted, with multiple branches, cork trunks, platforms and elevated hides.

Minimum dimensions for an adult; larger is always preferable. Protected species: listed on CITES Appendix II and Annex B of the EU regulation; legal documents (invoice/CITES) are mandatory at purchase. Captive-bred (CBB) individuals must strongly be preferred: wild-caught (WC) animals acclimatize poorly, often arrive parasitized and dehydrated, and put pressure on a fragile wild population.

Humidity

70–90 %

Humid tropical atmosphere. Daily mistings and substrate kept moist at depth; nonetheless ensure good ventilation to avoid stagnant air and respiratory problems.

Substrate

Untreated topsoil/humusCoco fiberSphagnum mossLeaf litter

Deep substrate (15–25 cm minimum) that retains moisture, allows digging and supports bioactive function. Cork bark and branches for the vertical structure.

UVB

Recommended

Recommended, even indispensable. A diurnal, heliophilic monitor: provide a high-performance UVB tube (T5 HO, UVB index 6% / forest-to-tropical type) positioned above the basking zone, with shade available. Supplement with calcium and vitamin D3.

Water source

Always available

A large, clean water source allowing bathing and hydration; renew frequently. Humidity is mainly provided by the mistings. The animals also drink droplets from the leaves and décor.

Origin

Varanidae

Endemic to Batanta Island, Raja Ampat archipelago (West Papua, Indonesia). Humid tropical rainforest. Very restricted range.

Feeding & health

Diet

Carnivore (insectivore with opportunistic tendencies) — Large insects (Dubia roaches, locusts, grasshoppers), geckos, quail eggs, occasional chicks/rodents.

A very active visual hunter. Base the diet on varied, well-fed insects dusted with calcium/vitamins. Strongly limit fatty prey (rodents, chicks): the species is very prone to obesity and hepatic lipidosis in captivity. Adjust the feeding frequency to age and body condition.

Breeding

Oviparous

Clutch 2–5 eggs/young. Clutch of 2 to 5 eggs, laid in a loose, moist substrate or a nest box. Long incubation, about 150 to 200 days at around 29–30 °C depending on sources. Protected species (CITES II): captive breeding is encouraged to reduce pressure on the wild Batanta population.

Health watch points

Obesity and hepatic lipidosis (excess of fatty prey, insufficient volume)
Metabolic bone disease (MBD) from calcium/D3 deficiency or inadequate UVB
Internal parasitism, common in wild-caught (WC) individuals
Thermal burns from contact with an unprotected heat source
Respiratory infections linked to insufficient ventilation or temperatures that are too low
Chronic stress and food refusal (handling, enclosure too small or too exposed)

Morphs & genetics

Registry of 0 documented gene for Blue tree monitor.

Frequently asked questions

Answers to the most common questions about keeping the blue tree monitor.

How big does an adult Blue tree monitor get?▾

An adult Blue tree monitor typically measures 0.9–1.1 m (total adult length. the largest member of the prasinus complex. the extremely long prehensile tail makes up nearly two thirds of the total length.).

What temperature and humidity does a Blue tree monitor need?▾

A gradient of roughly 26–28 °C on the cool side to 30–33 °C on the warm side, with a basking spot of 48–55 °C. Humidity 70–90 %.

What does a Blue tree monitor eat?▾

Carnivore (insectivore with opportunistic tendencies): Large insects (Dubia roaches, locusts, grasshoppers), geckos, quail eggs, occasional chicks/rodents..

Is the Blue tree monitor a good reptile for beginners?▾

Advanced level. Nervous, shy and watchful: this is NOT a species for handling. Captive-bred (CBB) individuals become fairly confident feeders but remain prone to stress; any regular restraint is discouraged. Like all monitors, it has oral glands producing mildly toxic compounds: not life-threatening to humans, but the bite is powerful, painful and carries a high infection risk (heavy oral flora). Reserved for experienced keepers with a large vertical volume available. Plan ahead: a lifespan of 10–15 yrs.

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