Ptyas carinata
Silhouette: Alex Slavenko · PhyloPic
In 3 days ~40% in a week ~70%
Ptyas carinata, commonly known as the keeled rat snake, also called King koros is a species of colubrid snake. It is found in Indonesia, Myanmar, Malaysia, Thailand, Philippines, Cambodia, Vietnam, Laos and Singapore. This little known species is probably the largest extant species in the diverse colubrid family that includes just over half of living snake species. Known adult lengths of snakes of this species in Taiwan measured anywhere from 1.21 to 2.75 m (4 ft 0 in to 9 ft 0 in). However, the reportedly maximum size was about 4 m (13 ft 1 in). Males reportedly average slightly larger than females. They are probably opportunistic predators on a variety of prey, such as rodents, though adult lizards are thought to be significant prey in Indonesia.
Media related to Ptyas carinata at Wikimedia Commons Photo by Noel Thomas - MacRitchie North Central Catchment Nature Reserve, Singapore Photo by John Varigos - Mt Rimau, Sipitang - Malaysia Species of Doi Suthep-Pui National Park
Ptyas carinata in Thailand Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Khao Sok National Park | 🇹🇭 Thailand | |
| 2 | Kaeng Krachan National Park | 🇹🇭 Thailand |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Kuala Lumpur | 🇲🇾 Malaysia | |
| 2 | Singapore | 🇸🇬 Singapore |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | National Zoo of Malaysia | 🇲🇾 Malaysia |
Possible
About 20% of wildlife watchers report a Keeled Rat Snake sighting in Khao Sok National Park on a given day, based on 8 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 29th most-seen of the 44 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.
January, June and August
In those months about 30% of wildlife watchers report a Keeled Rat Snake in Khao Sok National Park on a given day, against under 5% in March, May, September and November–December, the lowest months.
Between 2 and 5 am
Across all the parks we cover, that three-hour window holds the most Keeled Rat Snake sightings with a recorded time, and about half of them come between 6 am and 6 pm: it is most active around dawn and dusk.
Yes
Of the 2 parks where we can rate Keeled Rat Snake sightings, Khao Sok National Park has the highest daily chance: about 20%. Next come Kaeng Krachan National Park (Thailand, about 10%).
Same genus: Ptyas
The closest relatives of the Keeled Rat Snake that you can see in Khao Sok National Park (genus Ptyas, Asian Rat Snakes) are Chinese Ratsnake (about 20%) and Brown Rat Snake (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Keeled Rat Snake is recorded against all the reptiles logged in Khao Sok National Park (8 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.
