Craspedocephalus andalasensis
Silhouette: Vijay Karthick · PhyloPic
In 3 days ~50% in a week ~80%
Craspedocephalus andalasensis, commonly known as the Sumatran palm pit viper, is a venomous pitviper species native to the Indonesian island of Sumatra. C. andalasensis is known from North Sumatra and West Sumatra. Though known from a few specimens only, it is likely to be widespread in Sumatra.
C. andalasensis occurs in wet montane forests at elevations of 500–1,130 m (1,640–3,710 ft) above sea level. Although it is negatively impacted by deforestation, it is believed to be widespread enough to not be threatened overall. C. andalasensis occurs in the Mount Leuser National Park. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Gunung Leuser National Park | 🇮🇩 Indonesia |
More parks will be added in future updates.
Possible
About 20% of wildlife watchers report a Sumatran Palm Pit Viper sighting in Gunung Leuser National Park on a given day, based on 12 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 20th most-seen of the 47 reptiles we can rate there. Over three days the chance rises to about 50%, and over a week to about 80%, if each day is a fresh chance.
March, July–August and October–November
In those months about 30% of wildlife watchers report a Sumatran Palm Pit Viper in Gunung Leuser National Park on a given day, against under 5% in February, April, June and December, the lowest months.
Between 1 and 4 pm
Across all the parks we cover, that three-hour window holds the most Sumatran Palm Pit Viper sightings with a recorded time, and about 6 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
Only Gunung Leuser National Park, in our data
Gunung Leuser National Park is the only park on Wallace's Line with enough records to rate Sumatran Palm Pit Viper sightings: about 20% of wildlife watchers there report one on a given day.
Same family: Viperidae
The closest relatives of the Sumatran Palm Pit Viper that you can see in Gunung Leuser National Park (family Viperidae, Vipers) are Wagler's Pit Viper (about 70%), Gunalen's Pitviper (about 20%) and Hagen’s Pitviper (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Sumatran Palm Pit Viper is recorded against all the reptiles logged in Gunung Leuser National Park (12 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.
