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Asian Water Monitor Fact File

Appearance

The Asian water monitor is a large species of water monitor. Their long body is covered with dark brown or black scales. On their underside there may be yellow spots. These spots fade as the lizard ages. Running back across the head from the eye is a black band with a yellow edge.

As a monitor lizard they have a large forked tongue which can be used to sense prey. Monitors are the only lizards to have a forked tongue. This trait is shared with snakes. This is flicked out of the mouth to gather scents. This tongue is colored blue.

Their nostrils are positioned near the tip of the snout which is uncommon in monitors.

They have a long tail which may compromise over half their body length. The tail is flattened with a dorsal keel to assist with swimming. While swimming the tail is used as a rudder. It is also used for defense.

Some specimens of the Asian water monitor have been recorded at lengths exceeding 3m (9.8ft) though 1.5m (4.9ft) is considered average. An average monitor may weigh up to 25kg (55lbs) though again larger specimens are possible.

Diet

Asian water monitors are carnivores. They will feed on a range of reptiles, mammals, birds, insects and eggs. In addition to this they take carrion.

Food is swallowed whole. To allow additional room to achieve this they can dislocate the thyroid bone.

asian water monitor

Scientific Name

Varanus salvator

Conservation Status

Least Concern

Weight

25kg (55lbs)

Length

3m (9.8ft)

Lifespan

20 years

Diet

Carnivorous

Range

Their range extends across much of South-East Asia. They can be found in the following countries: Bangladesh, Cambodia, China, Hong Kong; India, Indonesia, Lao People's Democratic Republic, Malaysia, Myanmar, Singapore, Sri Lanka, Thailand and Viet Nam.

Habitat

They make their home across a wide range of habitats including mangroves, swamps, wetlands, forest and shrubland.

As they have proven tolerant of human expansion they can often be found in canals, cities and agricultural areas.

Reproduction

Breeding takes place from April to October.

Following a successful mating the female will lay up to 50 eggs. These are laid alongside rotting logs and stumps.

The eggs incubate for 5-6 months before hatching.

Sexual maturity is tied to size but is typically reached around 2 years old. Males mature at 1m (3.3ft) long while female are mature at 0.5m (1.64ft).

Behavior

Due to their powerful leg muscles they are quick runners and able to chase down prey at high speeds.

Males create a home territory. This is fiercely defended and they will attack other males who enter their area often leaving large wounds on their opponent.

These semi-aquatic animals spend much of their day around water. They are able to remain fully submerged for up to 30 minutes. Asian water monitors can live in both fresh and salt water and have been seen swimming out at sea.

They are also agile climbers and can easily move through the trees.

asian water monitor

Predators and Threats

Asian water monitors face threats from humans due to hunting for their skin. They appear resilient to hunting as large females are often not targeted.

If the Asian water monitor is being hunted by a predator they jump from tree to tree until they can get to the safety of a river.

They also fall prey to vehicle strikes and are collected for the pet trade.

Quick facts

Asian water monitors have a number of additional names including common water monitor, Malayan water monitor, two-banded monitor, rice lizard, ring lizard and plain lizard.

Photo Credits

Top - Bernard DUPONT from FRANCE / CC BY-SA (https://creativecommons.org/licenses/by-sa/2.0)

Bottom - Jerzy Strzelecki / CC BY (https://creativecommons.org/licenses/by/3.0)

References

Byers, D. 2000. "Varanus salvator" (On-line), Animal Diversity Web. Accessed August 01, 2020 at https://animaldiversity.org/accounts/Varanus_salvator/

Ash, D., 2020. Varanus Salvator, Water Monitor. [online] Thai National Parks. Available at: <https://www.thainationalparks.com/species/water-monitor> [Accessed 2 August 2020].

Bennett, D., Gaulke, M., Pianka, E.R., Somaweera, R. & Sweet, S.S. . 2010. Varanus salvator. The IUCN Red List of Threatened Species 2010: e.T178214A7499172. https://dx.doi.org/10.2305/IUCN.UK.2010-4.RLTS.T178214A7499172.en. Downloaded on 01 August 2020.

Ecologyasia.com. 2020. Malayan Water Monitor - Varanus Salvator. [online] Available at: <https://www.ecologyasia.com/verts/lizards/malayan_water_monitor.htm> [Accessed 2 August 2020].

Seaworld.org. 2020. Malayan Water Monitor Facts And Information | Seaworld Parks & Entertainment. [online] Available at: <https://seaworld.org/animals/facts/reptiles/malayan-water-monitor/> [Accessed 2 August 2020].

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