Osteocephalus castaneicola
Silhouette: Dmitry Bogdanov (vectorized by T. Michael Keesey) · PhyloPic
In 3 days ~40% in a week ~70%
Osteocephalus castaneicola is a species of frog in the family Hylidae. It is found in lowland Amazonia of northern Bolivia, adjacent southeastern Peru, and western Brazil (Acre, south-central Amazonas, and Rondônia). It breeds in water-filled fruit capsules of the Brazil nut, a characteristic also alluded to in its specific name castaneicola derived from the Latin castanea (horse chestnut, Aesculus), the root of the vernacular name castaña for the Brazil nut, together with the Latin colō meaning "to inhabit".
Adult males measure 48–51 mm (1.9–2.0 in) and adult females 48–63 mm (1.9–2.5 in) in snout–vent length. The snout is rounded in dorsal view and rounded, slightly inclined posteroventrally in lateral profile. The canthus rostralis is distinct. The tympanum is large, oval to round in shape. The supratympanic fold is conspicuous and covers the upper edge of the tympanum. The fingers have basal webbing whereas the toes are three quarters webbed. The dorsum is tan to pale brown to purple brown. and has some narrow irregular, dark brown markings. The upper lip has a narrow pale supralabial line that expands into a subocular spot. The flanks are uniformly pale. The... Wikipedia →
Recording
Peru · 2018
© Ben (Tremarctos Photography) · Xeno · CC BY-NC-SA 4.0
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Manu National Park | 🇵🇪 Peru | |
| 2 | Tambopata National Reserve | 🇵🇪 Peru |
With luck
About 10% of wildlife watchers report a Bolivian Spiny-backed Frog sighting in Manu National Park on a given day, based on 16 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 30th most-seen of the 67 amphibians we can rate there. Over three days the chance rises to about 40%, and over a week to about 70%, if each day is a fresh chance.
March and November–January
In those months about 20% of wildlife watchers report a Bolivian Spiny-backed Frog in Manu National Park on a given day, against under 5% in February and September, the lowest months. Those are among Manu National Park's wettest months, with about 240 mm of rain a month against 60 mm in August.
Between 8 and 11 pm
Across all the parks we cover, that three-hour window holds the most Bolivian Spiny-backed Frog 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.
Yes
Of the 2 parks where we can rate Bolivian Spiny-backed Frog sightings, Manu National Park has the highest daily chance: about 10%. Next come Tambopata National Reserve (Peru, about 10%).
Same genus: Osteocephalus
The closest relatives of the Bolivian Spiny-backed Frog that you can see in Manu National Park (genus Osteocephalus, Broad-headed Tree Frogs) are Giant Broad-headed Treefrog (about 10%), Common Bromeliad Treefrog (about 10%) and Urubamba Spiny-backed Frog (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Bolivian Spiny-backed Frog is recorded against all the amphibians logged in Manu National Park (16 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.
