Ahaetulla isabellina
Silhouette: Alex Slavenko · PhyloPic
In 3 days ~60% in a week ~90%
Ahaetulla isabellina, also known as Wall's vine snake, is a species of tree snake endemic to the southern Western Ghats of India. It was formerly considered a subspecies of A. nasuta, which is now considered to only be endemic to Sri Lanka. A 2020 study found A. nasuta to be a species complex of A. nasuta sensu stricto as well as A. borealis, A. farnsworthi, A. isabellina, and A. malabarica, elevating A. isabellina to species. The specific epithet is a reference to the isabelline yellow coloration of the species' dorsal body in live condition, which distinguishes it from other species in the complex.
Body, very slender, bright green with blue obscure patches; in some specimens uniform olive to light brown. Rostral scale, infralabials and the midbody along venter are light green to light blue; sometimes there is a yellow ventral stripe along the notched ventral keels. Inter-scalar skin is white with black and white anteriorly-converging bars along forebody, becoming reddish along hindbody. Tail and subcaudals are green. The eye vary from yellow to orange with light brown marbled patterns; horizontal pupil with a light blue or yellow colouration around... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Periyar National Park | 🇮🇳 India |
More parks will be added in future updates.
No species of the same family or order lives in Periyar National Park, so these are its closest relatives here: other reptiles.
Possible
About 30% of wildlife watchers report a Wall's Vine Snake sighting in Periyar National Park on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 6th most-seen of the 7 reptiles we can rate there. Over three days the chance rises to about 60%, and over a week to about 90%, if each day is a fresh chance.
October
In that month about 50% of wildlife watchers report a Wall's Vine Snake in Periyar National Park on a given day, against under 5% in December to April, the lowest months. That is one of Periyar National Park's wettest months, with about 330 mm of rain against 15 mm in February.
Between 6 and 9 am
Across all the parks we cover, that three-hour window holds the most Wall's Vine Snake sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only Periyar National Park, in our data
Periyar National Park is the only park on Wallace's Line with enough records to rate Wall's Vine Snake sightings: about 30% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Wall's Vine Snake is recorded against all the reptiles logged in Periyar 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.
