Osteocephalus buckleyi
Silhouette: Dmitry Bogdanov (vectorized by T. Michael Keesey) · PhyloPic
In 3 days ~20% in a week ~50%
Osteocephalus buckleyi, also known as Buckley's slender-legged treefrog, is a species of frog in the family Hylidae. It is found along the periphery of the Amazon Basin in Bolivia, Peru, Ecuador, Colombia, northeastern Brazil, Venezuela, Guyana, Suriname, and French Guiana, and also in the Orinoco Delta in Venezuela. It is probably a species complex. Some sources treat Osteocephalus vilmae from Ecuador and Peru as a valid species.
The specific name buckleyi honours Clarence Buckley, a collector active in Ecuador in 1880s and who collected the type series. Males measure 38–45 mm (1.5–1.8 in) and females 40–51 mm (1.6–2.0 in) in snout–vent length. The dorsum is pale green with dark blotches. A yellow or coffee colored medial vertebral stripe might be present. The flanks vary from cream to light brown with darker spots that can approach black. In males, the dorsal skin has a mixture of small and large tubercles with keratinized points, whereas in adult females the dorsal tubercles are very dispersed. The head is almost as long as wide; the snout is truncated. The finger disks are expanded.
Natural habitats of Osteocephalus... Wikipedia →
| # | 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 Buckley's Slender-legged Treefrog 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.
April, July and November
In those months about 20% of wildlife watchers report a Buckley's Slender-legged Treefrog in Yasuní National Park on a given day, against under 5% in May–June, August–October and December–February, the lowest months.
Between 7 and 10 pm
Across all the parks we cover, that three-hour window holds the most Buckley's Slender-legged Treefrog 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 Buckley's Slender-legged Treefrog sightings: about 10% of wildlife watchers there report one on a given day.
Same genus: Osteocephalus
The closest relatives of the Buckley's Slender-legged Treefrog that you can see in Yasuní National Park (genus Osteocephalus, Broad-headed Tree Frogs) are Giant Broad-headed Treefrog (about 30%), Yasuni Bromeliad Treefrog (about 20%) and Flat-headed Bromeliad Treefrog (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Buckley's Slender-legged Treefrog 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.
