Argus monitor — Care Sheet & Morphs

Husbandry requirements

Argus monitor — origin: Northern Australia and southern New Guinea (savannahs, floodplains, riparian habitats). Like all monitors, listed on CITES Appendix II (Annex B of the EU): proof of legal origin required at purchase..

Terrarium temperature gradient

Night min22 °C

Cool side26–30 °C

Warm side32–38 °C

Basking spot50–60 °C

A heliophilic savannah species: it is essential to provide a very intense hot spot (basking surface 50–60 °C) and a strong thermal gradient. Control the heating with a thermostat and check the SURFACE temperature of the spot with an infrared thermometer to prevent burns. Heating/lighting off at night, a drop to ~22 °C tolerated.

Enclosure (adult)

240 × 120 × 120 cm

Custom-built terrestrial enclosure/terrarium, very large, with deep substrate for digging

Absolute minimum dimensions for an adult; always aim bigger for this very active species. Provide deep substrate (>50 cm), sturdy hides/burrows, a large water basin, climbing supports and a raised basking spot. A standard commercial enclosure is insufficient.

Humidity

40–60 %

Moderate atmosphere but with a humid shelter/burrow allowing thermoregulation and a good shed. The substrate should stay slightly moist at depth, dry at the surface; avoid stagnant humidity and lack of ventilation.

Substrate

Compactable soil/sand/clay mix (holds burrows)Organic topsoil free of fertilizer and pesticideLeaf/wood-chip litter on the surface (optional)

Deep substrate (>50 cm), moist at depth, to allow the digging of burrows, an essential behavior of the species. Avoid pure sand (impaction risk) and dusty substrates.

UVB

Recommended

Indispensable. High-intensity UVB (T5 HO tube ~10–14%) covering the basking zone, to be replaced every 6–12 months. Combine UVB + a strong hot spot + calcium intake to prevent osteodystrophy.

Water source

Always available

A large tub of clean water allowing drinking and immersion; the species swims and likes to bathe. Clean and renew frequently (the animal often defecates in the water).

Origin

Varanidae

Northern Australia and southern New Guinea (savannahs, floodplains, riparian habitats). Like all monitors, listed on CITES Appendix II (Annex B of the EU): proof of legal origin required at purchase.

Feeding & health

Diet

Carnivore — Rodents, birds (chicks), fish, large insects, occasional eggs

Extreme feeding drive: feed with tongs or at a distance, mind your fingers. Offer varied whole prey; limit fatty prey and ration to prevent obesity, which is very common in captivity. Supplement non-gut-loaded prey with calcium and vitamins (D3).

Breeding

Oviparous

Clutch 6–15 eggs/young. Lays in a deep burrow; provide a nesting site with deep, moist substrate for the female. Artificial incubation generally around 28–31 °C for several months. Breeding reserved for experienced keepers.

Health watch points

Obesity (overfeeding and lack of activity)
Osteodystrophy / MBD (UVB and calcium deficiency)
Thermal burns (poorly secured hot spots)
Internal parasites (common in wild-caught animals)
Gout / kidney damage (excess protein and/or dehydration)

Morphs & genetics

Registry of 0 documented gene for Argus monitor.

Frequently asked questions

Answers to the most common questions about keeping the argus monitor.

What size can an adult Argus monitor reach?▾

This is a large lizard: the total length (body and tail) ranges from 100 to 140 cm, and some large males can approach 150 cm. Males are markedly larger and more massive than females, with long legs and a long, tapering tail.

What enclosure should you provide for the Argus monitor?▾

An adult needs a custom-built enclosure of at least 240 x 120 x 120 cm, with a deep substrate over 50 cm for digging, sturdy hides or burrows, a large water basin, climbing supports and a raised basking spot. Standard commercial terrariums are far too small for this very active species.

What temperatures and basking spot should be maintained?▾

This is a highly heliophilic savanna species that demands an extremely intense basking spot, between 50 and 60°C at the surface, with a warm side at 32-38°C and a cool side at 26-30°C. Always control the heating with a thermostat and check the surface temperature with an infrared thermometer to prevent burns; at night, heating and lighting are switched off, with a drop to around 22°C being tolerated.

Is UVB essential for this species?▾

Yes, absolutely: a high-intensity UVB source (a T5 HO tube around 10-14%) covering the basking zone is required, replaced every 6 to 12 months. Combined with a powerful basking spot and calcium supplementation, it helps prevent osteodystrophy, a bone disease common in captivity among poorly supplemented monitors.

What humidity and substrate allow good digging?▾

A moderate humidity of 40 to 60% is enough, provided you include a deep humid shelter or burrow where the animal can retreat to thermoregulate and shed properly. The substrate, a compactable soil/sand/clay mix, must stay humid deep down and dry at the surface to allow the building of burrows, an essential behaviour in this fossorial species; avoid pure sand, which poses a risk of impaction.

What does the Argus monitor eat, and how can bites be avoided?▾

A carnivore with an extreme feeding drive, it eats rodents, birds (chicks), fish, large insects and sometimes eggs. Its quickness means you should feed with tongs or at a distance to protect your fingers; you should also offer varied prey and limit fatty prey, as obesity is very common in this species in captivity.

Is a large water basin necessary?▾

Yes, a large basin of clean water is essential: the Argus monitor drinks and likes to submerge itself to swim and bathe. Since it often defecates in it, the water must be cleaned and renewed frequently.

What is its lifespan and its day-to-day temperament?▾

This is a long-term commitment: expect 15 to 20 years in captivity under good conditions, sometimes more. The temperament is energetic, lively and rather defensive, with a powerful bite and claws; it is also the champion of "tripoding", the bipedal posture in which it rises up on its hind legs and the base of its tail to survey its surroundings.

Is the Argus monitor suitable for a beginner?▾

No, it is a species classed as advanced, reserved for experienced keepers able to manage a large, energetic and defensive lizard in a large custom-built enclosure. Native to northern Australia and southern New Guinea, it is, like all monitors, listed on CITES Appendix II: proof of legal origin is required at purchase.

Does the Argus monitor breed easily in captivity?▾

It is an oviparous species that lays in a deep burrow; you therefore need to provide a laying site with a deep, humid substrate for the female. Artificial incubation is generally carried out at around 28-31°C for several months, and breeding remains reserved for experienced keepers.

What health problems should be watched for in the Argus monitor?▾

The most common are obesity linked to overfeeding and lack of activity, osteodystrophy from a UVB or calcium deficiency, thermal burns from a poorly secured basking spot, internal parasites (especially in wild-caught animals) and gout linked to excess protein or to dehydration.

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