Atractus major
Silhouette: Alex Slavenko · PhyloPic
In 3 days ~30% in a week ~60%
Atractus major, the brown ground snake or big ground snake, is a species of snake in the family Colubridae. The species can be found in Ecuador, Venezuela, Brazil, Peru, and Colombia. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Yasuní National Park | 🇪🇨 Ecuador |
More parks will be added in future updates.
With luck
About 10% of wildlife watchers report a Big Ground Snake sighting in Yasuní National Park on a given day, based on 10 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 33rd most-seen of the 49 reptiles we can rate there. Over three days the chance rises to about 30%, and over a week to about 60%, if each day is a fresh chance.
December
In that month about 30% of wildlife watchers report a Big Ground Snake in Yasuní National Park on a given day, against under 5% in February, May–June and August–October, the lowest months.
Between 8 and 11 pm
Across all the parks we cover, that three-hour window holds the most Big Ground Snake sightings with a recorded time, and about 6 in 10 of them come between 6 pm and 6 am: it is seen both by day and at night.
Only Yasuní National Park, in our data
Yasuní National Park is the only park on Wallace's Line with enough records to rate Big Ground Snake sightings: about 10% of wildlife watchers there report one on a given day.
Same family: Colubridae
The closest relatives of the Big Ground Snake that you can see in Yasuní National Park (family Colubridae, Colubrid Snakes) are Blunthead Tree Snake (about 30%), Diurnal Vine Snake (about 20%) and Catesby's Snail-eater (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Big Ground Snake is recorded against all the reptiles logged in Yasuní National Park (10 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.
