Engystomops freibergi
Silhouette: Luke Larter, based on photo by Amanda Lea · PhyloPic
In 3 days ~60% in a week ~90%
Freiberg's forest toadlet (Engystomops freibergi) is a frog native to the Amazonian Brazil, southeastern Peru, and Amazonian Bolivia. For a while, it was considered to be a synonym of Engystomops petersi, its sibling species, but its species status was resurrected in a study published in 1998. Nevertheless, these two species have also been mixed in later studies, and there are records from the Guianas that have not yet been allocated to either species. Divergence of these two species seems to have been driven by behavioural isolation related to male call characteristics more than geographic isolation.
Engystomops freibergi are relatively small frogs. Males measure 24–36 mm (0.94–1.42 in) in snout–vent length and females 25–39 mm (0.98–1.54 in). Dorsal colouration is variable. Skin on dorsum is warty, bearing small tubercles with scattered larger tubercles.
Engystomops freibergi is a locally common species found in lowland Amazon rainforest. These frogs are nocturnal and usually found in the leaf litter in primary forest. They feed primarily on termites. Scientists have reported the frogs in protected places Tambopata National Reserve, Manu National Park... Wikipedia →
Recording0:31
Brazil · 2021
© Marllus Rafael Almeida · iNaturalist · CC BY-NC 4.0
Recording
Bolivia · 2025
© Carlos Justiniano Parada · iNaturalist · CC BY-NC 4.0
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Manu National Park | 🇵🇪 Peru | |
| 2 | Tambopata National Reserve | 🇵🇪 Peru |
Possible
About 30% of wildlife watchers report a Freiberg's Foam-Frog sighting in Manu National Park on a given day, based on 55 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 10th most-seen of the 67 amphibians we can rate there. Over three days the chance rises to about 60%, and over a week to about 90%, if each day is a fresh chance.
August
In that month about 40% of wildlife watchers report a Freiberg's Foam-Frog in Manu National Park on a given day, against under 5% in September, the lowest month. That is one of Manu National Park's driest months, with about 60 mm of rain against 290 mm in February.
Between 8 and 11 pm
Across all the parks we cover, that three-hour window holds the most Freiberg's Foam-Frog sightings with a recorded time, and about 7 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 Freiberg's Foam-Frog sightings, Manu National Park has the highest daily chance: about 30%. Next come Tambopata National Reserve (Peru, about 20%).
Same family: Leptodactylidae
The closest relatives of the Freiberg's Foam-Frog that you can see in Manu National Park (family Leptodactylidae, Southern Frogs) are Peru white-lipped frog (about 30%), Madre de Dios Thin-toed Frog (about 30%) and Perez's Snouted Frog (about 30%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Freiberg's Foam-Frog is recorded against all the amphibians logged in Manu National Park (55 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.
