Nannophrys ceylonensis
Silhouette: Jose Carlos Arenas-Monroy · PhyloPic
In 3 days ~60% in a week ~90%
Nannophrys ceylonensis, commonly known as the Sri Lanka rock frog or the Ceylon streamlined frog, is a species of frog. It used to be placed in the large frog family Ranidae but a phylogenetic study was undertaken using DNA sequences and it is now included in the family Dicroglossidae. It is endemic to Sri Lanka where its natural habitats are subtropical or tropical moist lowland forests, subtropical or tropical moist montane forests, rivers and streams.
Female Sri Lanka rock frogs grow to a length of about 5 centimetres (2.0 in) while males grow to 4 centimetres (1.6 in). The colour is olive green or yellowish-brown, mottled with brown patches. The legs have transverse bars of brown. When sitting on alga covered rocks it is well camouflaged.
The Sri Lanka rock frog is endemic to south, central and western Sri Lanka where it is found in wet tropical forests at altitudes of up to 1,200 metres (3,900 ft) above sea level. It is a largely aquatic species and occurs in fast flowing mountain streams, under boulders and on wet rocks beside waterfalls. It is also found on land in disturbed areas where there are suitable breeding locations such... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sinharaja Forest Reserve | 🇱🇰 Sri Lanka |
More parks will be added in future updates.
Possible
About 20% of wildlife watchers report a Sri Lanka rock frog sighting in Sinharaja Forest Reserve on a given day, based on 31 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 13th most-seen of the 25 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 and November
In those months about 40% of wildlife watchers report a Sri Lanka rock frog in Sinharaja Forest Reserve on a given day, against under 5% in September, the lowest month.
Between 5 and 8 am
Across all the parks we cover, that three-hour window holds the most Sri Lanka rock frog sightings with a recorded time, and about 7 in 10 of them come between 6 am and 6 pm: it is most active around dawn and dusk.
Only Sinharaja Forest Reserve, in our data
Sinharaja Forest Reserve is the only park on Wallace's Line with enough records to rate Sri Lanka rock frog sightings: about 20% of wildlife watchers there report one on a given day.
Same family: Dicroglossidae
The closest relatives of the Sri Lanka rock frog that you can see in Sinharaja Forest Reserve (family Dicroglossidae, Fork-tongued Frogs) are Common skittering frog (about 30%), Indian Five-Fingered Frog (about 30%) and Common Paddy Field Frog (about 30%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Sri Lanka rock frog is recorded against all the amphibians logged in Sinharaja Forest Reserve (31 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.
