Varanus nebulosus
Silhouette: Steven Traver · PhyloPic
In 3 days ~40% in a week ~70%
The clouded monitor (Varanus nebulosus) is a species of monitor lizard, native to Myanmar, Thailand and Laos, Vietnam, to West Malaysia, Singapore, Sumatra, and Java. They are excellent tree climbers. It belongs to the subgenus Empagusia along with the Bengal monitor, the Dumeril's monitor and other monitor lizards. It had previously been listed as a subspecies of Bengal monitor by some herpetologists. It is a diurnal monitor.
Clouded monitors can on occasion grow up to 1.5 metres long. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Taman Negara National Park | 🇲🇾 Malaysia | |
| 2 | Cat Tien National Park | 🇻🇳 Vietnam | |
| 3 | Kaeng Krachan National Park | 🇹🇭 Thailand | |
| 4 | Khao Sok National Park | 🇹🇭 Thailand | |
| 5 | Khao Yai National Park | 🇹🇭 Thailand |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Singapore | 🇸🇬 Singapore | |
| 2 | Kuala Lumpur | 🇲🇾 Malaysia | |
| 3 | Johor Bahru | 🇲🇾 Malaysia |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | National Zoo of Malaysia | 🇲🇾 Malaysia | |
| 2 | Zagreb Zoo | 🇭🇷 Croatia | |
| 3 | Key West Aquarium | 🇺🇸 United States |
Possible
About 20% of wildlife watchers report a Clouded Monitor sighting in Khao Yai National Park on a given day, based on 13 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 21st most-seen of the 46 reptiles we can rate there. Over three days the chance rises to about 40%, and over a week to about 70%, if each day is a fresh chance.
June and July
In those months about 30% of wildlife watchers report a Clouded Monitor in Khao Yai National Park on a given day, against under 5% in February–March, August and October–December, the lowest months. Those are among Khao Yai National Park's wettest months, with about 220 mm of rain a month against 15 mm in December.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Clouded Monitor sightings with a recorded time, and about 7 in 10 of them come between 6 am and 6 pm: it is most active around dawn and dusk.
5th of 5
Of the 5 parks where we can rate Clouded Monitor sightings, Khao Yai National Park ranks 5th at about 20%. The best odds are in Taman Negara National Park (Malaysia, about 70%), Cat Tien National Park (Vietnam, about 60%) and Kaeng Krachan National Park (Thailand, about 40%). All parks ranked.
GBIF citizen-science records
It is estimated from how often the Clouded Monitor is recorded against all the reptiles logged in Khao Yai National Park (13 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
