Ptyas carinata
Silhouette: Alex Slavenko · PhyloPic
In 3 days ~20% in a week ~40%
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 |
With luck
About 10% of wildlife watchers report a Keeled Rat Snake sighting in Kaeng Krachan National Park on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 51st most-seen of the 56 reptiles we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
August
In that month about 20% of wildlife watchers report a Keeled Rat Snake in Kaeng Krachan National Park on a given day, against under 5% in January–February, April–June and September–October, the lowest months. That is one of Kaeng Krachan National Park's wettest months, with about 200 mm of rain against 30 mm in December.
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.
2nd of 2
Of the 2 parks where we can rate Keeled Rat Snake sightings, Kaeng Krachan National Park ranks 2nd at about 10%. The best odds are in Khao Sok National Park (Thailand, about 20%).
GBIF citizen-science records
It is estimated from how often the Keeled Rat Snake is recorded against all the reptiles logged in Kaeng Krachan National Park (5 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.
