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Nile Monitor
Varanus niloticus
The Nile monitor (Varanus niloticus) is a large, powerful African lizard that requires expert handling, a massive semi-aquatic enclosure, and a high-protein diet.
Class:Squamata
Order:Squamata
Family:Varanidae
Genus:Varanus
Species:Varanus niloticus
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Water Temperature
24 - 55 °C
Environment
Terrestrial / Semi-aquatic
Humidity
60 - 80 %
Day temperature
28 - 35 °C
Night temperature
24 - 26 °C
Adult size
98 cm
UVB
High
Species description
Geographical Origin and Habitat: Widely distributed throughout sub-Saharan Africa, living along rivers, lakes, swamps, and coastal estuaries. It is a highly semi-aquatic reptile that rarely ventures far from permanent water sources, adapting to both rainforests and wooded savannas.
Taxonomy and Genetics: Belongs to the family Varanidae, genus *Varanus*. It is one of the largest members of the monitor lizard family. Shows general genetic stability across its massive range, though regional morphological variations exist.
Behavior and Habits: Exceptionally active, intelligent, and territorial. An excellent swimmer and climber. Possesses a formidable defensive temperament; when threatened, it will hiss loudly, whip its muscular tail, and bite fiercely. Rarely becomes docile in captivity, demanding extreme caution.
Morphology: Features a massive, elongated body, robust head, and powerful limbs with sharp claws. The tail is laterally compressed to act as a rudder while swimming. Adults typically reach lengths between 1.5 and 2.2 meters. Pattern consists of yellow spots forming crossbands on a black or dark gray base.
Care, breeding and tankmates
Terrarium Setup: Requires a massive, custom-built enclosure or greenhouse room (at least 4x2x2 meters for an adult). At least one-third of the floor space must be dedicated to a heated, filtered water pool deep enough for swimming. Include heavy-duty climbing structures, large logs, and stable rocks.
Lighting and Heating: Needs high-output heating elements to create a basking spot of 45-50°C (113-122°F), with an ambient gradient of 26-30°C (78-86°F). High-output 10% (or higher) UVB lighting is mandatory to support calcium metabolism and overall health.
Humidity and Hydration: Ambient humidity should be kept between 60% and 75%, maintained via misting. The large indoor pool is vital for hydration, but requires heavy filtration or daily water changes as these monitors frequently defecate in water.
Feeding and Supplementation: Highly voracious opportunistic carnivore. Juveniles feed on insects, small fish, and crustaceans. Adults eat rodents, whole fish, eggs, chicks, and mollusks. Dust food for growing juveniles with calcium and D3 supplements regularly.
Compatibility: Strictly solitary. Due to high territorial aggression and the risk of severe injuries or cannibalism, Nile monitors must be housed individually.
Health and Common Diseases: Metabolic Bone Disease (MBD) is common without proper UVB and calcium supplementation. Respiratory infections can occur if kept too cold. Injuries from live prey bites are a major risk; feed pre-killed or thawed frozen prey.
Geographic Origin and Distribution
Widely distributed throughout sub-Saharan Africa, living along rivers, lakes, swamps, and coastal estuaries. It is a highly semi-aquatic reptile that rarely ventures far from permanent water sources, adapting to both rainforests and wooded savannas.
Origin
Africa and Madagascar
Reptile profile
- Diet
- No verified data available
- Life expectancy
- No verified data available
- Adult size
- 98 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 98 cm. The ReptTraits v1.2 source reports a maximum adult measurement of 98 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.
Related species
Recommendations grouped by close relatives, companion choices, and similar care.
