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Asian Water Monitor
Varanus salvator
One of the largest lizard species in the world, capable of exceeding 2-3 meters in length. Requires room-sized custom enclosures with a large filtered pool and adequate heating. Highly intelligent animal requiring experienced management.
Class:Squamata
Order:Squamata
Family:Varanidae
Genus:Varanus
Species:Varanus salvator
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Water Temperature
25 - 45 °C
pH Value
6 - 7
Environment
Terrestrial / Semi-aquatic
Humidity
70 - 90 %
Day temperature
24 - 28 °C
Ambient temperature
29 °C
Night temperature
18 - 22 °C
Basking spot
45 °C
Adult size
117 cm
Minimum enclosure
>= 500 L
UVB
High
Species description
Geographical Origin and Habitat: Endemic to South and Southeast Asia, from India to the islands of Indonesia (Sumatra, Java, Sulawesi). They are highly aquatic, inhabiting mangrove forests, swamps, canals, and river banks.
Taxonomy and Genetics: Belonging to the family Varanidae. Commonly known as the Asian Water Monitor or Water Monitor. It is a highly active apex predator adapted for swimming and climbing. No significant color morphs are widely established in captivity, though local subspecies show variations.
Behavior and Habits: Diurnal and semi-aquatic. Renowned for their high cognitive intelligence, they can recognize individual keepers, learn routines, and be clicker or target-trained. Socialized animals can become remarkably docile, but unhandled adults can show strong defensive behavior.
Morphology: Can reach 2–3 meters in length and weigh 20–30 kg. Males grow significantly larger, longer, and heavier than females, and have a thicker tail base.
Care, breeding and tankmates
Terrarium Setup: Housing in standard cages is impossible. Requires a custom room-sized enclosure (minimum 250x250x200 cm). Provide a massive, heated, and filtered water pool deep enough for the lizard to swim in. A heavy-duty pond filter is required due to high waste output.
Lighting and Heating: Extremely warm requirements. Keep the cool side at 25–28°C, with a basking hot spot cluster reaching 45–50°C created by multiple halogen lamps. High-output T5 UVB bulbs (12–14%) are mandatory for skeletal health.
Humidity and Hydration: Maintain high humidity levels of 70–90%. Spray daily. Change the pool water regularly and maintain high-quality biological filtration.
Feeding and Supplementation: Strictly carnivorous. Feed a varied diet of frozen-thawed rats, chicks, quail, whole fish, crabs, and rabbits. Avoid overfeeding to prevent obesity and fatty liver disease. Always feed using long metal tongs to avoid accidental bites.
Compatibility: Strictly solitary. House individually to prevent serious territorial fights and injuries.
Health and Common Diseases: Lack of UVB and calcium leads to metabolic bone disease. Bites, scratches, and tail-whips can cause severe injuries and require immediate medical care due to bacterial infections. Always wear heavy welding gloves when handling large, nervous specimens.
Geographic Origin and Distribution
Endemic to South and Southeast Asia, from India to the islands of Indonesia (Sumatra, Java, Sulawesi). They are highly aquatic, inhabiting mangrove forests, swamps, canals, and river banks.
Origin
Selective breeding and cultivarsSouth and Southeast Asia
Reptile profile
- Diet
- No verified data available
- Life expectancy
- No verified data available
- Adult size
- 117 cm
- Lifestyle/Microhabitat
- No verified data available
- Activity cycle
- No verified data available
- Sociality
- No verified data available
- Reproduction
- No verified data available
- Handling tolerance
- No verified data available
- Brumation
- No verified data available
- Molting
- No verified data available
The catalog's scalar value is 117 cm. The ReptTraits v1.2 source reports a maximum adult measurement of 117 cm for this species, recorded as snout–vent length (SVL). These figures are not interchangeable: the first is the profile's editorial reference, whereas the second is a published maximum under a specific measurement convention; differences among sources can reflect sex, population, life stage and measuring method.
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
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