Ctenophryne geayi
Silhouette: Dmitry Bogdanov (vectorized by T. Michael Keesey) · PhyloPic
In 3 days ~30% in a week ~60%
Ctenophryne geayi (common name: brown egg frog, Spanish: sapito apuntado de Geay) is a species of frog in the family Microhylidae. It is widely distributed in the northern parts of South America, in the Guianas (Guyana, Suriname, French Guiana) and in the Amazon Basin in Venezuela, Colombia, Ecuador, Peru, Bolivia, and Brazil. It might actually represent two species.
Adult males measure 32–43 mm (1.3–1.7 in) and adult females 42–55 mm (1.7–2.2 in) in snout–vent length. The body is rotund, and the head is narrower than the body. The snout is blunt from above and rounded, slightly projecting in profile. The tympanic ring is barely visible externally. The fingers have rounded tips. The toes have flattened tips and webbing that is more extensive in males than in females.
Coloration is pale brown dorsally, with darker brown flanks and anterior and posterior surfaces of the thighs. The throat is dark grayish brown, and other ventral surfaces are dark brown with white flecks. A vertebral line might be present. There are two ventral color patterns.
Specimens from the northern and western part of the range have pale flecks or very small spots, no more than 1 mm (0.04 in)... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Manu National Park | 🇵🇪 Peru | |
| 2 | Tambopata National Reserve | 🇵🇪 Peru |
With luck
About 10% of wildlife watchers report a Brown Egg Frog sighting in Manu National Park on a given day, based on 14 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 43rd most-seen of the 67 amphibians we can rate there. Over three days the chance rises to about 30%, and over a week to about 60%, if each day is a fresh chance.
December
In that month about 40% of wildlife watchers report a Brown Egg Frog in Manu National Park on a given day, against under 5% in March and May–September, the lowest months. That is one of Manu National Park's wettest months, with about 250 mm of rain against 60 mm in August.
Between 8 and 11 pm
Across all the parks we cover, that three-hour window holds the most Brown Egg Frog sightings with a recorded time, and about 6 in 10 of them come between 6 pm and 6 am: it is seen both by day and at night.
Yes
Of the 2 parks where we can rate Brown Egg Frog sightings, Manu National Park has the highest daily chance: about 10%. Next come Tambopata National Reserve (Peru, about 10%).
Same family: Microhylidae
The closest relatives of the Brown Egg Frog that you can see in Manu National Park (family Microhylidae, Narrow-mouthed Frogs) are Amazon Sheep Frog (about 40%), Eyebrowed Humming Frog (about 10%) and Acre's Oval Frog (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Brown Egg Frog is recorded against all the amphibians logged in Manu National Park (14 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.
