Epicrates cenchria
Silhouette: Alex Slavenko · PhyloPic
In 3 days ~50% in a week ~80%
The rainbow boa (Epicrates cenchria) is a boa species endemic to South America. A semi-arboreal species (not only do they climb in the wild but also proven in captivity), it is known for its attractive iridescent/holographic sheen caused by structural coloration. Five subspecies are currently recognized, including the nominate subspecies described here.
The rainbow boa is found in South America. It occurs east of the Andes, roughly reaching northern Argentina (in the provinces Chaco, Córdoba, Corrientes, Formosa, Salta, Santiago del Estero and Tucumán). The rainbow boa's habitat generally consists of humid woodlands and rainforests, but it can also be found in open savannas.
The rainbow boa is typically orange, brown, or reddish brown, with a paler belly and black markings: three parallel stripes on the head, rings down the back, and lateral blotches with a crescent over them, although there is a great deal of natural variation that may be heightened by artificial breeding. It is 4 to 6 feet in length and sexually dimorphic, as females are slightly longer and have wider abdomens. Males are stronger when compared with females of the same... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Yasuní National Park | 🇪🇨 Ecuador | |
| 2 | Manu National Park | 🇵🇪 Peru | |
| 3 | Cuyabeno Wildlife Reserve | 🇪🇨 Ecuador | |
| 4 | Tambopata National Reserve | 🇵🇪 Peru |
Possible
About 20% of wildlife watchers report a Western Rainbow Boa sighting in Cuyabeno Wildlife Reserve on a given day, based on 10 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 13th most-seen of the 21 reptiles we can rate there. Over three days the chance rises to about 50%, and over a week to about 80%, if each day is a fresh chance.
December
In that month about 50% of wildlife watchers report a Western Rainbow Boa in Cuyabeno Wildlife Reserve on a given day, against under 5% in February–August and October, the lowest months.
Between 7 and 10 pm
Across all the parks we cover, that three-hour window holds the most Western Rainbow Boa 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.
Among the best
Of the 4 parks where we can rate Western Rainbow Boa sightings, Cuyabeno Wildlife Reserve ranks 3rd at about 20%, level with the leaders once rounded. The best odds are in Yasuní National Park (Ecuador, about 20%) and Manu National Park (Peru, about 20%).
Same family: Boidae
The closest relatives of the Western Rainbow Boa that you can see in Cuyabeno Wildlife Reserve (family Boidae, Boas) are Anaconda (about 60%), Garden Tree Boa (about 60%) and Boa Constrictor (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Western Rainbow Boa is recorded against all the reptiles logged in Cuyabeno Wildlife Reserve (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.
