Eunectes beniensis
Silhouette: Gamma 124 · PhyloPic
In 3 days ~60% in a week ~90%
Eunectes beniensis is a boa species known from the northeastern parts of Bolivia and possibly nearby Brazil. Its common names, the Bolivian anaconda and Beni anaconda, are derived from the geographic location of its native habitat: the Beni area of Bolivia. Like all boas, it is nonvenomous. It eats fish, chickens, dogs, and cats.
Eunectes beniensis is a species of boa, reaching between 3.3–4.4 meters (11–14 ft) in length and can weigh up to 35 kilograms (77 lb). It was initially believed to be the result of hybridization between the green (Eunectes murinus) and yellow anaconda (Eunectes notaeus), but was later determined to be a distinct species. Its taxonomic status is unclear due to lack of information and the similarity in appearance to Eunectes notaeus. It is closely related to Eunectes notaeus and Eunectes deschauenseei.
The Bolivian anaconda's habitat usually consists of wetlands and other muddy, swampy or flooded areas. It is known only from northern Bolivia. In April 2022, three researchers published data on an observation of Bolivian river dolphins playing with a large (presumably deceased) E. beniensis specimen, possibly...
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Madidi National Park | 🇧🇴 Bolivia |
More parks will be added in future updates.
No species of the same family or order lives in Madidi National Park, so these are its closest relatives here: other reptiles.
Possible
About 30% of wildlife watchers report a Beni Anaconda sighting in Madidi National Park on a given day, based on 7 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 4th most-seen of the 6 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.
August and October
In those months about 40% of wildlife watchers report a Beni Anaconda in Madidi National Park on a given day, against under 5% in June, the lowest month.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Beni Anaconda sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only Madidi National Park, in our data
Madidi National Park is the only park on Wallace's Line with enough records to rate Beni Anaconda sightings: about 30% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Beni Anaconda is recorded against all the reptiles logged in Madidi National Park (7 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.
