Calloselasma rhodostoma
Silhouette: Steven Traver · PhyloPic
In 3 days ~30% in a week ~50%
Common names: Malayan ground pit viper, Malayan pit viper, Malayan ground snake, Malayan moccasin, Javan pit viper, Indonesian pit viper. Calloselasma is a monotypic genus created for a pit viper species, Calloselasma rhodostoma, which is endemic to Southeast Asia from Thailand to northern Malaysia and on the island of Java. No subspecies are currently recognized.
Found in Nepal, Thailand, Cambodia, Laos, Vietnam, northern West Malaysia and on the Indonesian island of Java. The type locality is listed as "Java". There are unconfirmed, but credible reports from southern Myanmar (Burma), northern Sumatra and northern Borneo.
Attains an average total length of 76 cm (30 in), with females being slightly longer than males. Occasionally, they may grow as long as 91 cm (36 in). A specimen with a total length of 81 cm (32 in) has a tail 9 cm (3.5 in) long.
Dorsally it is reddish, grayish, or pale brown, with two series of large, dark brown, black-edged triangular blotches, which are alternating or opposite. There is also a thin dark brown vertebral stripe, which may be interrupted or indistinct in some specimens. The upper labials are pink or yellowish... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Jakarta | 🇮🇩 Indonesia |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Siam Serpentarium | 🇹🇭 Thailand | |
| 2 | Snake Farm of Queen Saovabha Memorial Institute | 🇹🇭 Thailand |
With luck
About 10% of wildlife watchers report a Malayan Pit Viper sighting in Jakarta on a given day, based on 9 verified sightings from GBIF citizen-science data. It is the 38th most-seen of the 47 reptiles we can rate there. Over three days the chance rises to about 30%, and over a week to about 50%, if each day is a fresh chance.
December
In that month about 40% of wildlife watchers report a Malayan Pit Viper in Jakarta on a given day, against under 5% in February–March, May and July–November, the lowest months.
Between 3 and 6 pm
Across all the parks we cover, that three-hour window holds the most Malayan Pit Viper 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.
Only Jakarta, in our data
Jakarta is the only city on Wallace's Line with enough records to rate Malayan Pit Viper sightings: about 10% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Malayan Pit Viper is recorded against all the reptiles logged in Jakarta (9 verified sightings), 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.
