Oreobates quixensis
Silhouette: Dmitry Bogdanov (vectorized by T. Michael Keesey) · PhyloPic
In 3 days ~40% in a week ~70%
Oreobates quixensis, also known as the common big-headed frog, is a species of frog in the family Strabomantidae. It is found in the upper Amazon Basin in Bolivia, western Brazil, Colombia, Ecuador, and Peru. It is a very common terrestrial frog of primary and secondary tropical moist forest, also to be found in clearings, open areas and banana groves.
Oreobates quixensis are large among the species of the genus Oreobates with adults measuring 35–63 mm (1.4–2.5 in) in snout–vent length. The head is large and wider than long; the snout is short. The dorsum is pale brown to dark brown with purple tonalities and cream flecks; the skin is granular, with round keratinized granules and small, sparse, prominent, and enlarged warts. Breeding is by direct development. Gravid females contain 15–51 eggs.
Phylogenomic analysis in 2021 revealed that O. quixensis is closely related to Oreobates saxatilis. The study found the two species to be mutually polyphyletic, meaning individuals of one species are sometimes genetically closer to the other than to their own kind. This suggests either recent divergence, historical gene flow, or that current morphological definitions... Wikipedia →
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Ecuador · 2025
© Marc Anderson · XC1076523 · CC BY-NC-ND 4.0
Recording0:45
Brazil · 2021
© Marllus Rafael Almeida · iNaturalist · CC BY-NC 4.0
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Yasuní National Park | 🇪🇨 Ecuador | |
| 2 | Cuyabeno Wildlife Reserve | 🇪🇨 Ecuador | |
| 3 | Manu National Park | 🇵🇪 Peru |
Possible
About 20% of wildlife watchers report a Common Big-headed Frog sighting in Cuyabeno Wildlife Reserve on a given day, based on 8 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 9th most-seen of the 15 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.
June and November
In those months about 30% of wildlife watchers report a Common Big-headed Frog in Cuyabeno Wildlife Reserve on a given day, against under 5% in February–April, September–October and December, the lowest months.
Between 7 and 10 pm
Across all the parks we cover, that three-hour window holds the most Common Big-headed 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.
2nd of 3
Of the 3 parks where we can rate Common Big-headed Frog sightings, Cuyabeno Wildlife Reserve ranks 2nd at about 20%. The best odds are in Yasuní National Park (Ecuador, about 40%).
Same order: Anura
The closest relatives of the Common Big-headed Frog that you can see in Cuyabeno Wildlife Reserve (order Anura, Frogs and Toads) are South American Common Toad (about 40%), Giant Broad-headed Treefrog (about 40%) and Painted Antnest Frog (about 40%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Common Big-headed Frog is recorded against all the amphibians logged in Cuyabeno Wildlife Reserve (8 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.
