Nyctimantis rugiceps
Silhouette: Dmitry Bogdanov (vectorized by T. Michael Keesey) · PhyloPic
In 3 days ~20% in a week ~50%
Nyctimantis rugiceps, commonly known as the brown-eyed treefrog, is a species of frog in the family Hylidae. It is known from the Amazon rainforest in Ecuador, Peru, and Colombia, and it is likely to also occur in adjacent Brazil. Its natural habitats are primary and secondary lowland tropical rainforest.
Nyctimantis rugiceps breeds in bamboo and tree holes. Females raise the tadpoles on trophic (unfertilized) eggs. Wikipedia →
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Ecuador · 2025
© Marc Anderson · XC1076557 · CC BY-NC-ND 4.0
| # | 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 Brown-eyed Tree Frog sighting in Yasuní National Park on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 43rd most-seen of the 49 amphibians we can rate there. Over three days the chance rises to about 20%, and over a week to about 50%, if each day is a fresh chance.
December
In that month about 30% of wildlife watchers report a Brown-eyed Tree Frog in Yasuní National Park on a given day, against under 5% in February–July and September–October, the lowest months.
Between 8 and 11 pm
Across all the parks we cover, that three-hour window holds the most Brown-eyed Tree Frog 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.
Only Yasuní National Park, in our data
Yasuní National Park is the only park on Wallace's Line with enough records to rate Brown-eyed Tree Frog sightings: about 10% of wildlife watchers there report one on a given day.
Same family: Hylidae
The closest relatives of the Brown-eyed Tree Frog that you can see in Yasuní National Park (family Hylidae, Hylid Tree Frogs) are Giant Broad-headed Treefrog (about 30%), Canelos Treefrog (about 20%) and Rocket Tree Frog (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Brown-eyed Tree Frog is recorded against all the amphibians logged in Yasuní National Park (5 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.
