Reptiles Active during the day

Clouded Monitor

Varanus nebulosus

iNaturalist Wikipedia

The Clouded Monitor is the arboreal acrobat of the lizard world, blending perfectly into the dappled light of Southeast Asian forests. A master of both earth and sky, this intelligent scavenger is a fascinating visitor to any tropical backyard.

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Quick Identification

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Size

Total length typically 1 to 1.5 meters (3.3 to 5 feet); weight ranges from 1 to 5 kg (2.2 to 11 lbs).

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Colors

Greyish-brown to olive base with numerous light yellow spots or ocelli; dark temporal stripes extend from the eyes down the neck.

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Key Features

Light yellow spots creating a 'cloudy' appearance
Nostrils located midway between the eye and the snout tip
Strong, curved claws optimized for tree climbing
Long, powerful tail used for balance and defense

When You’ll See Them

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Activity pattern Active during the day

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Peak hours 9 AM - 3 PM

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Season Year-round

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Diet A generalist carnivore and scavenger; it feeds on insects, spiders, small mammals, frogs, bird eggs, and carrion.

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Habitat Lowland rainforests, mangroves, scrublands, and suburban areas with mature trees and gardens.

public Geographic range

Where Does the Clouded Monitor Live?

Native to the tropical heart of Southeast Asia, the Clouded Monitor thrives across a wide geographic footprint. This resilient lizard is found throughout Myanmar, Thailand, Laos, and Vietnam, extending southward into Peninsular Malaysia and Singapore. It is also a common sight on the Indonesian islands of Sumatra and Java, where it occupies both dense jungle and the fringes of human settlements.

Basemap © OpenStreetMap contributors

8 Countries

2.8M km² Range

Least Concern Conservation

TH Thailand MY Malaysia Singapore ID Indonesia Vietnam Laos Myanmar Cambodia

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iNaturalist / Verified observation data

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Behavior

The Clouded Monitor is a highly active, diurnal reptile that splits its time between the forest floor and the canopy. Unlike its cousin, the Asian Water Monitor, this species is a master climber, often seen scaling vertical trunks with surprising speed to bask in the sun or escape predators. They are generally solitary and wary of humans, though they can become accustomed to presence in quiet suburban gardens.

These lizards are intelligent foragers, using their long, forked tongues to 'taste' the air and track down prey or carrion. When threatened, they may hiss loudly, inflate their necks to appear larger, or lash out with their whip-like tails. Despite their formidable appearance, they are non-aggressive toward humans and prefer to retreat into thick brush or up a tree at the first sign of trouble.

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Camera Tips

To capture a Clouded Monitor on camera, focus on transition zones. Place your camera near the base of large, leaning trees or along stone walls where they like to bask and hunt. Since they are diurnal, ensure your camera's motion sensor is optimized for daytime triggers. Mounting the camera about 12-18 inches off the ground, angled slightly upward, will provide the best view of their specialized climbing posture.

Scent is the best way to draw these monitors into frame. A small amount of pungent bait, such as an open tin of sardines or a cracked egg placed inside a perforated container, will lure them in. Because they are cautious, place the lure in a spot that offers some overhead cover; they are more likely to linger if they feel protected from aerial predators like eagles.

Use a fast shutter speed if your camera allows it, as their flicking tongues and quick movements can cause motion blur. If you are monitoring a specific tree trunk where you have seen them climbing, a vertical mounting position on an adjacent tree can capture spectacular 'action shots' of them scaling the bark.

Similar Species

Species that look similar or are commonly confused with Clouded Monitor.

Bengal Monitor

Very closely related, but the Bengal monitor generally lacks the distinct yellowish 'clouded' spotting and has nostrils closer to the eye.

Dumeril's Monitor

Specializes in eating crabs and has a broader, flatter snout with different head scaling.

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Frequently Asked Questions

Clouded Monitors are strictly diurnal, meaning they are active during daylight hours. They are most frequently seen between 9 AM and 3 PM when the sun is high, allowing them to bask and maintain the high body temperature needed for hunting.

You can attract Clouded Monitors by providing a 'wild' corner in your garden with thick leaf litter and mature trees. Scent lures like fish or eggs can be very effective, but be careful as these may also attract stray cats or other unwanted wildlife.

They are opportunistic carnivores. Their diet includes beetles, grubs, earthworms, small rodents, frogs, and the eggs of ground-nesting birds. They also play a vital ecological role as scavengers, cleaning up carrion.

Yes, they are remarkably adaptable. In Singapore and parts of Thailand, they are frequently found in urban parks and suburban gardens, provided there are enough trees for climbing and no intensive pesticide use that kills off their insect prey.

The easiest way is to look at the nostrils; the Clouded Monitor's nostrils are located halfway between the eye and the snout, while the Water Monitor's nostrils are right at the tip. Clouded Monitors are also more likely to be found high in trees, whereas Water Monitors prefer being near ponds and canals.

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