Pareas macularius
Silhouette: Marius Burger (photograph) · PhyloPic
In 3 days ~40% in a week ~70%
Pareas macularius, the mountain slug snake, is a species of snake found in southeast Asia and surrounding countries. Ochre brown to red-brown with somewhat reticulated (having a grid- or network-like pattern) bars formed by particoloured scales—white in front and deep claret brown behind—that give the snake a half-banded, half-spotted appearance. A white nuchal collar mottled with claret-red is usually present. Brown spotted and mottled belly.
Fifteen rows of smooth dorsal scales are present across the entire body, though they may be weakly keeled posteriorly. Possesses 6 or 7 supralabial scales, anteriorly high and narrow; 5 to 7 subocular scales, not contacting the labial scales; One loreal scale; Subequal frontal scales; 8 sublabial scales; & 3 pairs of chin shields.
Like its congeners, Pareas macularius is a nocturnal, semi-arboreal, oviparous snail and slug specialist. Pareas macularius can be found across much of southeastern Asia, including India, Bangladesh, Myanmar, Thailand, Laos, Vietnam, Malaysia and southern China.
The specific name macularius derives from the Latin word... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Doi Inthanon National Park | 🇹🇭 Thailand | |
| 2 | Khao Sok National Park | 🇹🇭 Thailand |
With luck
About 10% of wildlife watchers report a Mountain Slug Snake sighting in Doi Inthanon National Park on a given day, based on 8 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 15th most-seen of the 30 reptiles we can rate there. Over three days the chance rises to about 40%, and over a week to about 70%, if each day is a fresh chance.
August
In that month about 30% of wildlife watchers report a Mountain Slug Snake in Doi Inthanon National Park on a given day, against under 5% in March, July, September and December, the lowest months. That is one of Doi Inthanon National Park's wettest months, with about 340 mm of rain against 20 mm in February.
Between 7 and 10 pm
Across all the parks we cover, that three-hour window holds the most Mountain Slug Snake sightings with a recorded time, and about 8 in 10 of them come between 6 pm and 6 am: it is mostly seen at night.
Yes
Of the 2 parks where we can rate Mountain Slug Snake sightings, Doi Inthanon National Park has the highest daily chance: about 10%. Next come Khao Sok National Park (Thailand, about 10%).
GBIF citizen-science records
It is estimated from how often the Mountain Slug Snake is recorded against all the reptiles logged in Doi Inthanon National Park (8 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.
