Osteocephalus taurinus
Silhouette: Dmitry Bogdanov (vectorized by T. Michael Keesey) · PhyloPic
In 3 days ~70% in a week ~90%
The Manaus slender-legged tree frog (Osteocephalus taurinus), also known as the giant broad-headed tree frog, is a species of frog in the family Hylidae found in Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname, and Venezuela. Its natural habitats are subtropical or tropical dry forest, subtropical or tropical moist lowland forest, moist savanna, rivers, intermittent freshwater marshes, and canals and ditches. It is threatened by habitat loss. It is also reported to produce bufotenin.
The adult male frog measures 71 to 92 mm long in snout-vent length and the adult female 90 to 101 mm. The male frogs have warty skin and the female frogs have smooth skin. The skin of the frog's dorsum is light bronw to dark brown in color. Some frogs have a light brown line down the middle of the back. The back legs have dark brown transverse stripes. The iris of the eye is gold in color with black reticulation. The belly is cream to whitish in color.
This frog is arboreal and nocturnal. When the male frogs sing for the female frogs, they sit on short plants or in the water. The female frog lays 2000 eggs per clutch, laid on the surface of the... Wikipedia →
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Ecuador · 2025
© Marc Anderson · XC1002261 · CC BY-NC-ND 4.0
Recording1:21
Suriname · 1968
© M.S. Hoogmoed · XC882825 · CC BY 4.0
Recording0:27
Brazil · 2020
© Marllus Rafael Almeida · iNaturalist · CC BY-NC 4.0
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cuyabeno Wildlife Reserve | 🇪🇨 Ecuador | |
| 2 | Tambopata National Reserve | 🇵🇪 Peru | |
| 3 | Yasuní National Park | 🇪🇨 Ecuador | |
| 4 | Manu National Park | 🇵🇪 Peru |
Possible
About 30% of wildlife watchers report a Giant Broad-headed Treefrog sighting in Yasuní National Park on a given day, based on 45 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 7th most-seen of the 49 amphibians we can rate there. Over three days the chance rises to about 70%, and over a week to about 90%, if each day is a fresh chance.
February, June–July and September
In those months about 40% of wildlife watchers report a Giant Broad-headed Treefrog in Yasuní National Park on a given day, against under 5% in May and December, the lowest months.
Between 7 and 10 pm
Across all the parks we cover, that three-hour window holds the most Giant Broad-headed 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.
3rd of 4
Of the 4 parks where we can rate Giant Broad-headed Treefrog sightings, Yasuní National Park ranks 3rd at about 30%. The best odds are in Cuyabeno Wildlife Reserve (Ecuador, about 40%) and Tambopata National Reserve (Peru, about 40%).
Same genus: Osteocephalus
The closest relatives of the Giant Broad-headed Treefrog that you can see in Yasuní National Park (genus Osteocephalus, Broad-headed Tree Frogs) are Yasuni Bromeliad Treefrog (about 20%), 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 Giant Broad-headed Treefrog is recorded against all the amphibians logged in Yasuní National Park (45 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.
