Rana ornativentris
Silhouette: Sharp Photography, sharpphotography.co.uk · PhyloPic
In 3 days ~10% in a week ~30%
The montane brown frog or Nikkō frog (Rana ornativentris) is a species of frog in the family Ranidae. It is endemic to Japan. Its natural habitats are subtropical or tropical dry forests, rivers, swamps, freshwater marshes, arable land, irrigated land, and seasonally flooded agricultural land. Wikipedia →
Recording0:22
Japan · 2025
© Daniel J. Layton · iNaturalist · CC BY 4.0
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Tokyo | 🇯🇵 Japan |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Ueno Zoological Gardens (West Garden) | 🇯🇵 Japan |
Rare
Under 5% of wildlife watchers report a Montane Brown Frog sighting in Tokyo on a given day, based on 23 verified sightings from GBIF citizen-science data. It is the 7th most-seen of the 11 amphibians we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
February and August–October
In those months about 10% of wildlife watchers report a Montane Brown Frog in Tokyo on a given day, against under 5% in March–July and November–January, the lowest months.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Montane Brown Frog sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only Tokyo, in our data
Tokyo is the only city on Wallace's Line with enough records to rate Montane Brown Frog sightings: under 5% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Montane Brown Frog is recorded against all the amphibians logged in Tokyo (23 verified sightings), 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.
