Trimeresurus erythrurus
Silhouette: Steven Traver · PhyloPic
In 3 days ~90% in a week >90%
Trimeresurus erythrurus, commonly known as the red-tailed bamboo pitviper, redtail bamboo pit viper, and redtail pit viper is a venomous pit viper species found in South Asia and Myanmar. No subspecies are currently recognized.
Males grow to a maximum total length 575 millimetres (22.6 in), of which the tail is 120 millimetres (4.7 in) in length. Females reach a maximum total length of 1,045 millimetres (41.1 in), with a tail length of 165 millimetres (6.5 in).
Scalation: dorsal scales in 23–25 longitudinal rows at midbody; first upper labial partially or completely fused to nasal; 9–13 upper labials, 1–2 rows of scales separate upper labials from the suboculars; 11–14 scales in a line between supraoculars; supraoculars rarely divided; temporal scales small, strongly keeled; ventral scales: males 153–174, females: 151–180; subcaudals: males 62–79, females 49–61, usually paired, occasionally unpaired shields present among paired series.
Color pattern: head uniform green, dorsum bright green, light ventrolateral stripe present in males, present or absent in females (Maslin [1942:23] says that the ventrolateral stripe is absent, but M.A. Smith [1943:523] states that it... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sundarbans National Park | 🇮🇳 India |
More parks will be added in future updates.
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Yangon Zoological Gardens | 🇲🇲 Myanmar (Burma) | |
| 2 | Alligator Adventure | 🇺🇸 United States |
No species of the same family or order lives in Sundarbans National Park, so these are its closest relatives here: other reptiles.
Likely
About 50% of wildlife watchers report a Spot-tailed Pitviper sighting in Sundarbans National Park on a given day, based on 14 verified sightings from GBIF citizen-science data from 2019 to 2026. Over three days the chance rises to about 90%, and over a week to over 90%, if each day is a fresh chance.
July
In that month about 80% of wildlife watchers report a Spot-tailed Pitviper in Sundarbans National Park on a given day, against about 10% in January to April, the lowest months. That is one of Sundarbans National Park's wettest months, with about 480 mm of rain against 15 mm in January. June and September have too few records to rate.
Between 2 and 5 pm
Across all the parks we cover, that three-hour window holds the most Spot-tailed Pitviper sightings with a recorded time, and about 7 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only Sundarbans National Park, in our data
Sundarbans National Park is the only park on Wallace's Line with enough records to rate Spot-tailed Pitviper sightings: about 50% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Spot-tailed Pitviper is recorded against all the reptiles logged in Sundarbans National Park (14 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.
