
Source: Wikimedia Commons
Varanus beccarii
An all-black tree monitor found only on the Aru Islands of Indonesia. At 90-120 cm it is relatively small for the group, an arboreal species that moves skilfully through the canopy with a long prehensile tail and sharp claws.
Varanus beccarii is an arboreal varanid found only on the Aru Islands of Indonesia. A member of the tree monitor group, the Varanus prasinus complex, it is relatively small for that group at 90 to 120 cm in total length. As its name suggests it is uniformly black, in contrast to the vivid greens and blues of its relatives. It wraps its long prehensile tail around branches and grips slender ones with long claws and enlarged scales on the soles of its feet. Because its range is confined to the Aru Islands its status is hard to assess, and the IUCN lists it as Data Deficient. In captivity, as with the other tree monitors, it needs both a hot basking site and humidity that never falls below 70 per cent. It dehydrates very easily and rehydrates only by drinking. It requires a tall enclosure with a deep leaf-litter layer and climbing routes built from branches of varying thickness. Nervous and fast-moving, it is demanding to keep.
Source: Wikipedia (CC BY-SA 4.0)
The Black Tree Monitor lives 15-20 years.
The Black Tree Monitor grows to 90-120cm.
Origin
The Aru Islands, Indonesia
Lifespan
15-20 years
Size
90-120cm
Humidity
70%
Sources: Reptiles Magazine: The Tree Monitors / Chameleon Academy: Blue Tree Monitors / Wikipedia (English) / Reptile Database
Edited & verified by: BreederDirect editorial team
The taxonomic, regulatory, and husbandry data on this page are compiled and verified against the authoritative primary sources below.
Accepted name: Varanus beccarii (Doria, 1874)
Authority databases: GBIF · Reptile Database
Nomenclature follows global taxonomic authority databases.
Varanidae spp. are listed in CITES Appendix II. Because of Appendix II listing, an international CITES registration certificate is not required, but an export permit issued by the exporting country is necessary for importation. In Japan, only 2 species of Varanidae are designated as Specified Animals; this species is not included. It does not fall under Designated Invasive Species under the Invasive Species Act.
Sources: CITES Appendices (Varanidae spp., Appendix II) / IUCN Red List
Regulations may change. Always verify the latest information with the relevant authorities.
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Crickets, dubia roaches and other insects, with rodents as a supplement
Figures published for the tree monitors call for a gradient reaching from a basking site of 49-54C down to cool areas of 27-28C. Supplemental heat is sometimes used at night to hold ambient temperatures at 27-28C. Humidity must not fall below 70 per cent; these lizards dehydrate easily and rehydrate only by drinking.
It is strongly arboreal, so climbing surface and height matter more than floor area. An enclosure of roughly 120 cm wide by 180 cm tall by 60 cm deep is cited for a pair, and larger is better. Use a deep leaf-litter layer and branches of varying thickness arranged both vertically and horizontally. Ventilation holes are considered unnecessary, since high humidity must be held.
In the wild it is an arboreal insectivore taking mainly arthropods, with small vertebrates as well. In captivity base the diet on crickets, dubia and other roaches with rodents as a supplement, dusting feeders with calcium.
It is nervous and fast, fleeing through vegetation when threatened and biting if cornered. It is not suited to handling and is kept singly or in pairs. Water is best offered in several small, shallow containers secured among the branches.
Varanidae spp. are listed on CITES Appendix II, so import requires an export permit; no Japanese registration certificate is needed for Appendix II. Of the varanids, only the Komodo dragon and the crocodile monitor are specified animals under Japanese law, and this species is not among them. The IUCN assesses it as Data Deficient and its range is confined to the Aru Islands, so confirm the origin of any animal you acquire.
Advanced. This is an advanced-level species. It requires specialized equipment and advanced husbandry skills with precise environmental control.
The average lifespan of Black Tree Monitor is 15-20 years. With proper care and nutrition, they can live a long and healthy life.
Black Tree Monitor typically reaches 90-120cm as an adult. Size may vary depending on care conditions and individual genetics.
Black Tree Monitor feeds on: Crickets, dubia roaches and other insects, with rodents as a supplement. Aim for a balanced diet with appropriate feeding frequency.
The price of Black Tree Monitor varies significantly depending on morph, size, and lineage. Check our market price page for the latest pricing information.
Last updated: September 28, 2026