Decor
- Rocks, tunnels and climbing branches at differing levels
- Artificial foliage for a naturalistic look
- Large cool-side water bowl — for drinking and to help raise humidity
Monitor lizards · Care guide
Argus Monitor Care Guide
Varanus panoptes
The Argus Monitor is native to the savannah and grasslands of Australia, New Guinea and Indonesia. Adults reach about 48–60″ — one of the larger monitors — so plan for serious space. Provide heat with a hot basking zone, humidity 60% day / 70% evening, T5 12% UVB, multi-level climbing, a large water bowl, and patient handling.
At a glance
Quick facts
Key parameters for day-to-day husbandry. Full detail is in the sections below.
-
Daytime probe
86–88 °F
30–31 °C · thermostat sensor
-
Night temp
~74 °F
~23 °C · thermostat evening
-
Humidity
60 / 70%
Day · evening with light spray
-
UVB
T5 12%
Ceiling-mounted tube
01 · Housing
Enclosure & housing
Large, active monitors from savannah and grassland habitats (~48–60″). Provide multi-level climbing branches, rocks and tunnels, a bio mix or coarser desert sand substrate, a solid temperature gradient, and a large cool-side water bowl that also supports humidity. Minimum size is for a single adult — plan for substantial space.
Adult minimum size
72″ W × 48″ H × 48″ D
For a single adult, or larger if you wish. Argus are large monitors (about 48–60″ full size), so the space requirement is real. Start babies in something smaller so you can interact without chasing them around a huge viv.
Substrate
- Bio mix, or mix with one of the coarser desert sands
- Slightly higher humidity needs than some other monitors
- Avoid fine mineral sands that can cause impaction
Cleaning
- Daily: spot clean to limit bacteria and odours
- About every six weeks: full clean if kept relatively clean — replace substrate, disinfect decor and vivarium
Housing diagram
Enclosure example
Front view 72″ wide × 48″ tall (depth 48″) · multi-level branches · rocks & tunnel · large cool-side water bowl
- Front proportions — 72″ wide × 48″ tall (3:2); depth 48″ — or larger
- Branches — multi-level climbing at differing heights
- Rocks — enrichment décor
- Tunnel — arched tunnel for enrichment
- Water bowl — large cool-side dish for drinking and humidity
- Heat & UV — heat dome warm end · T5 12% on the ceiling · hot basking zone
Setup diagram · 1 of 2
Top-down view
Heat bulb & probe left–right positions · Recommended temps need this layout
Setup diagram · 2 of 2
Front view
Looking into the vivarium · bulb on the ceiling · probe hangs down the back
- Heat bulb — about one-quarter from one side, halfway front to back (on / through the ceiling)
- Probe — one-quarter from the opposite side, hanging down the back about halfway down
02 · Climate
Temperature & UVB
Day/night cycling, a proper gradient, and UVB are essential for metabolism, appetite, and long-term health. Aim for about 60% humidity by day and 70% in the evening, with a large cool-side water bowl that also supports humidity.
Daytime temperature gradient
When the heat bulb and thermostat sensor are placed as instructed, a probe target of 86–88 °F (30–31 °C) creates this spread. The probe point is not the basking spot.
| Zone | Temperature |
|---|---|
| Cool side | ~84 °F (~29 °C) |
| Probe point (thermostat probe target) | 86–88 °F (30–31 °C) |
| Middle | 92–94 °F (33–34 °C) |
| Warm side | 100–110 °F (38–43 °C) |
| Basking spot (hottest point under bulb) | 120–150 °F (49–66 °C) |
| Night drop | Reduce thermostat by ~74 °F (~23 °C) |
Photoperiod & night
- Winter: about 12 hours light/heat
- Summer: up to 16 hours when days are longer
- Night: turn thermostat down to about 74 °F (23 °C)
- Clear day/night temperatures let metabolism slow — essential for rest
UVB lighting
- Recommended T5 unit with 12% UV output on the ceiling
- Mount straight across or diagonally (diagonal often places the power unit toward a rear vent)
- Replace every 12 months — UV output degrades over time
- Match UV on/off to heat schedule (morning on, evening off)
- UVA boosts appetite & activity; UVB enables vitamin D3 / calcium absorption
Humidity & water
Argus need slightly higher humidity than some other monitors. Maintain about 60% humidity during the day and increase to about 70% in the evening with a light spray. A large cool-side water bowl helps raise humidity as well as providing a drink.
Day
60%
Ambient humidity
Evening
70%
Light spray · night rise
- Light evening spray to raise humidity a little toward 70%
- Large cool-side water bowl — drinking and humidity support
- Always use de-chlorinated water (Reptisafe) or bottled water — never untreated tap
Climate diagram
Lighting setup
T5 12% UVB on the ceiling (straight or diagonal) · heat dome on the warm side · match UV to heat
- T5 12% UV unit — ceiling-mounted (straight or diagonal); UVA supports appetite & activity; UVB enables vitamin D3 / calcium absorption
- Heat dome — warm side; same on/off routine as UV (morning on, evening off)
- Photoperiod — 12 hours in winter, up to 16 hours in summer
- Replace UV every 12 months — output degrades even if the tube still glows
First power-up tip
Always have the thermostat dial turned down before you plug it into the mains for the first time.
03 · Nutrition
Diet & feeding
Insect-led diet with optional plant matter. Dust every feed, gut-load insects well, and use the method of 5 while settling.
At a glance
Feeding cheat sheet
- Type
- Insects · plant matter if accepted
- Settling
- Method of 5 — feed 5 insects at a time
- Settled
- Often 10–20+ crickets daily · adults may need 1–2 food-free days/week
- Dust
- Every feeding · 4:1 calcium : Nutrobal
- Water
- Large cool-side bowl · Reptisafe or bottled · helps humidity
Staple insects
Feed regularly · dust every feed
- Crickets, locusts, Dubia roaches
- Calci worms
- Vegetables if accepted (most will not eat them)
Occasional & meat
In moderation · great meat eaters
- Wax worms, mealworms, Morios
- Mice, chicks, small amounts of cat food
- Whole fish and eggs
Supplements — every feeding
Dust every feeding — live foods and salads — with a 4:1 mix of calcium : Nutrobal (4 parts calcium to 1 part Nutrobal). Mix first, then coat the food every time you feed.
Settling appetite — method of 5
New Argus Monitors are often stressed and may not eat well for the first few days. This is perfectly normal. Until you know their habits, use the method of 5: offer five insects at a time and wait until they are eaten before adding more. That reduces leftover insects that can stress or injure the animal. Once settled, 10–20+ crickets daily is relatively common; adults often need one or two food-free days each week.
Feeding style
- Hunting and chasing food provide exercise and enrichment
- Hand feeding can help bonding — excessive hand feeding can lead to obesity
- Great meat eaters — mice, chicks, small amounts of cat food, whole fish and eggs
Water
- Large cool-side bowl — for drinking and to help raise humidity
- Reptisafe or bottled water only — never untreated tap
Gut-load insects before offering — variety matters for calcium-to-phosphorus (Ca:P) and vitamins.
Why gut loading matters
Feeder insects must be well fed before offering. In the wild, lizards eat insects that themselves ate a wide variety of foods — providing complete nutrition and a better calcium-to-phosphorus (Ca:P) ratio.
- Use commercial gut-load foods with quality ingredients
- Add fresh reptile-safe vegetables for variety
- A single piece of carrot or potato is not enough — poor Ca:P and limited vitamins/minerals
Speak to a member of staff for more feeding advice.
04 · Behaviour
Handling & behaviour
Very active and well-tempered monitors. Settling and regular feeding come before handling.
- Step 1
Settle first
Allow the Argus Monitor to settle and begin eating regularly before handling — we recommend at least two successful feeds first. Adapting is stressful; early handling can make it worse.
- Step 2
Short sessions
Initial sessions: 5–10 minutes only. Lengthen as the Argus Monitor becomes more comfortable.
- Hygiene
Wash hands
Always wash or disinfect hands before and after handling to prevent bacteria transfer both ways.
- Warning
No aerosols
Do not use aerosols or plug-in air fresheners near the enclosure — the chemicals can harm your Argus Monitor.
05 · Welfare
Health & welfare
Prevention starts with correct husbandry — heat, UVB, hydration, and supplementation working together.
Best prevention: good husbandry
Correct temperatures, supplementation, hydration, and UVB keep the immune system and gut working well — supporting essential physiological processes.
Inert substrates Paper, lino, carpet — pros & cons
Pros
- Lower impaction risk
Cons
- Limit natural behaviours such as digging
- Can increase faecal contamination (waste less absorbed)
Questions
FAQ
What size vivarium does an Argus Monitor need?
For a single adult, a minimum of 72″ wide × 48″ tall × 48″ deep, or larger. Argus are large monitors (about 48–60″ full size) and need substantial floor space and height. Provide rocks, tunnels and multi-level climbing branches, artificial foliage, a bio mix or coarser desert sand mix, and a large cool-side water bowl that also helps raise humidity. Babies are easier to start in something smaller.
What temperatures does an Argus Monitor need?
Set the thermostat probe to 86–88 °F (30–31 °C) by day with the heat bulb about one-quarter from one side and the probe one-quarter from the opposite side, hanging down the back about halfway down. That creates a gradient of about 84 °F on the cool side, 92–94 °F in the middle, around 100–110 °F on the warm side, and a basking spot of about 120–150 °F under the bulb. At night turn the thermostat down to around 74 °F (23 °C).
What humidity do Argus Monitors need?
Argus need slightly higher humidity than some other monitors. Aim for about 60% during the day and raise it to about 70% in the evening with a light spray. A large cool-side water bowl also helps increase humidity. Use a bio mix, or mix with one of the coarser desert sands. Always treat water with a de-chlorinator such as Reptisafe, or use bottled water.
When can I start handling my Argus Monitor?
Allow the monitor to settle and begin eating regularly before handling — we recommend at least two successful feeds first. Initial sessions should be 5–10 minutes only; lengthen as they become more comfortable. Like all monitors, spend enough time with them if you want a well-tempered pet, and be aware of the space a large monitor needs. Always wash or disinfect hands before and after handling. Do not use aerosols or plug-in air fresheners near the enclosure.
What UVB do Argus Monitors need?
A T5 unit with a 12% UV tube mounted on the ceiling — straight across the top or diagonally (diagonal often places the power unit toward a rear vent). Replace the tube every 12 months because UV output degrades. Match UV on/off to the heat schedule: about 12 hours in winter and up to 16 hours in summer.
What do Argus Monitors eat?
Insects (crickets, locusts, Dubia, calci worms as staples; wax worms, mealworms and Morios in moderation) plus vegetables where accepted — most will not eat them. They are also great meat eaters — try mice, chicks, small amounts of cat food, whole fish and eggs. Dust every feed with a 4:1 calcium : Nutrobal mix. Use the “method of 5” while settling; settled animals may take 10–20+ crickets daily. Adults often need one or two food-free days per week. Hunting and chasing food provide exercise and enrichment.
Next steps
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