Acrantophis dumerili
Silhouette: Alex Slavenko · PhyloPic
In 3 days ~90% in a week >90%
Acrantophis dumerili, commonly known as Dumeril's boa, is a species of non-venomous snake in the family Boidae. The species is endemic to Madagascar. No subspecies are currently recognized. The specific name, dumerili, is in honor of French herpetologist André Marie Constant Duméril.
Adults of A. dumerili usually grow to 6.5 feet (2 m) in total length (including tail) with the maximum reported to be 8 feet, 6 inches (259 cm). Males usually have longer skinnier tails, while females tend to be larger overall.
The color pattern consists of a gray-brown ground color with darker patches, forming an effective camouflage against the leaf litter of the forest floor of their native habitat. A. dumerili is found on Madagascar. The type locality given in the original description is "Amérique mérid. ?", which is later given as "?" by Jan (1863).
Along the western coast and southwestern regions of Madagascar, it is found in a semi-arid habitat that gets fairly low amounts of precipitation. Durmeril Ground Boa's live in semi-arid forest along the western to southwestern parts of Madagascar. Their habitats consist of leaf litter, loose... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Berenty Reserve | 🇲🇬 Madagascar |
More parks will be added in future updates.
No species of the same family or order lives in Berenty Reserve, so these are its closest relatives here: other reptiles.
Likely
About 50% of wildlife watchers report a Dumeril's Boa sighting in Berenty Reserve on a given day, based on 6 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 4th most-seen of the 5 reptiles we can rate there. Over three days the chance rises to about 90%, and over a week to over 90%, if each day is a fresh chance.
May
In that month about 70% of wildlife watchers report a Dumeril's Boa in Berenty Reserve on a given day, against about 20% in July, the lowest month. That is one of Berenty Reserve's driest months, with about 15 mm of rain against 85 mm in February. June, September and December–March have too few records to rate.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Dumeril's Boa 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 Berenty Reserve, in our data
Berenty Reserve is the only park on Wallace's Line with enough records to rate Dumeril's Boa sightings: about 50% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Dumeril's Boa is recorded against all the reptiles logged in Berenty Reserve (6 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.
