Reptoria

Marbled water monitor (Varanus marmoratus)

Marbled water monitor (Varanus marmoratus), typical appearance of the species

Monitors & tegus · Difficulty: Intermediate

Key facts and care guidance for Marbled water monitor (Varanus marmoratus) (origin: The northern Philippines (Luzon)). Adult size around 120–150 cm total length. Life expectancy 15–20 years. The values below are carefully researched guidance.

Short answers

Marbled water monitor: How big does the enclosure need to be?

250×120×150 cm.

Marbled water monitor: What temperature does it need?

Daytime 28–34 °C, basking spot 45 °C, at night 22–25 °C.

Marbled water monitor: Does it need UVB lighting?

UVB: Essential (UVB 10.0–12 %).

Marbled water monitor: How long do they live?

Life expectancy: 15–20 years.

Marbled water monitor: Is it suitable for beginners?

Rather not – it is considered an intermediate species (difficulty: Intermediate).

Climate

Daytime temperature
28–34 °C
Night temperature
22–25 °C
Basking spot
45 °C
Humidity
65–80 %
UVB
Essential (UVB 10.0–12 %)

Enclosure

Minimum size
250×120×150 cm
Substrate
Soil and bark mulch, sturdy climbing branches, a large water section

Feeding

Food
Insects, roaches, fish, rodents, eggs
Feeding interval
2×/week

Key facts

Adult size
120–150 cm total length
Life expectancy
15–20 years
Origin
The northern Philippines (Luzon)
Protection status
CITES II; export from the Philippines is prohibited
Brumation
None
Cohabitation
Keep them singly. Monitors and tegus are territorial; grown animals defend their territory and injure each other with serious bites in the process. Even small size differences mean one animal claims the warm spot and the food for itself while the other falls behind — which is often only noticed once the weaker animal has already lost weight. For breeding, put them together only under supervision.

Notes

Split from the salvator complex, with marbled markings. Very alert and fast – a quiet spot and plenty of visual screening reduce stress considerably.

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Related species

All species in the care wiki →

What you need to start

To keep Marbled water monitor (Varanus marmoratus) you typically need: a suitable enclosure (250×120×150 cm), substrate (Soil and bark mulch, sturdy climbing branches, a large water section), a heat source with a thermostat, UVB lighting, thermometer and hygrometer, a water dish and hides. You will find equipment in the Reptoria marketplace.

The complete, interactive care database is in the Reptoria app.

Last updated: 9 October 2026 · Editor: Reptoria editorial team · Sources include: https://en.wikipedia.org/wiki/Marbled_water_monitor, https://reptile-database.reptarium.cz/species?genus=Varanus&species=marmoratus

All values are non-binding guidance and do not replace expert advice. Research thoroughly from several sources before acquiring and keeping an animal, and observe the applicable law (species and animal protection in particular).