Osteocephalus yasuni
Silhouette: Dmitry Bogdanov (vectorized by T. Michael Keesey) · PhyloPic
In 3 days ~50% in a week ~80%
Osteocephalus yasuni is a species of frogs in the family Hylidae. It is found in the upper Amazon Basin in southern Colombia (Amazonas and Caquetá Departments), Ecuador, and northeastern Peru (Loreto Region) at elevations of 70–250 m (230–820 ft) above sea level. The specific name yasuni refers to the Yasuni National Park where its type locality is.
Males measure 44–56 mm (1.7–2.2 in) and females 43–62 mm (1.7–2.4 in) in snout–vent length. The dorsum is brown with dark brown spots. The ventral coloration varies, from bright yellow to yellowish cream in adult males and cream in adult females. Males have rough skin while females have smooth skin. It has expanded discs on the fingers.
The species' natural habitats are tropical primary moist forests, in both terra firme and seasonally flooded forests. It breeds in temporary pools. It is nocturnal, although during some months males can be heard calling during the daytime.
It is locally affected by habitat loss, but there are no major threats to this reasonably abundant and widespread species. It occurs in a number of protected areas, including its namesake Yasuni National Park. Wikipedia →
Advertisement call0:24
Ecuador · 2019
© Ben (Tremarctos Photography) · XC986096 · CC BY-NC-SA 4.0
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Yasuní National Park | 🇪🇨 Ecuador |
More parks will be added in future updates.
Possible
About 20% of wildlife watchers report a Yasuni Bromeliad Treefrog sighting in Yasuní National Park on a given day, based on 30 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 13th most-seen of the 49 amphibians 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.
November
In that month about 60% of wildlife watchers report a Yasuni Bromeliad Treefrog in Yasuní National Park on a given day, against under 5% in January, March–June and August, the lowest months.
Between 7 and 10 pm
Across all the parks we cover, that three-hour window holds the most Yasuni Bromeliad Treefrog sightings with a recorded time, and about 9 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 Yasuni Bromeliad Treefrog sightings: about 20% of wildlife watchers there report one on a given day.
Same genus: Osteocephalus
The closest relatives of the Yasuni Bromeliad Treefrog that you can see in Yasuní National Park (genus Osteocephalus, Broad-headed Tree Frogs) are Giant Broad-headed Treefrog (about 30%), Flat-headed Bromeliad Treefrog (about 20%) and Buckley's Slender-legged Treefrog (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Yasuni Bromeliad Treefrog is recorded against all the amphibians logged in Yasuní National Park (30 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.
