Sylvirana nigrovittata
Silhouette: Michael Scroggie, from original photograph by John Bettaso, USFWS (original photograph in public domain). · PhyloPic
In 3 days ~30% in a week ~60%
Sylvirana nigrovittata, also known as the black-striped frog, black-spotted stream frog, sapgreen stream frog, etc., is a species of frog in the family Ranidae. It is found in northeastern India, Bangladesh, Nepal, southern China, Myanmar, Thailand, Cambodia, Laos, and Vietnam. It has been observed as high as 800 meters above sea level. The species was redelimited in 2018, and earlier literature may refer to other species; identifications from India and Bangladesh are still uncertain.
Sylvirana nigrovittata occurs in gentle streams in evergreen forest, including evergreen galleries in deciduous forest areas. The tadpoles develop quiet stream sections. It is a common species. It is threatened by the loss of forest canopy over streams it inhabits, as well as hydrological changes. It is not considered threatened by the IUCN. Wikipedia →
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Thailand · 2024
© Woraphot Bunkhwamdi · iNaturalist · CC BY-NC 4.0
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Thailand · 2024
© Cheryl Stinchcomb · iNaturalist · CC BY 4.0
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Thailand · 2025
© poom_2 · iNaturalist · CC BY-NC 4.0
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Doi Inthanon National Park | 🇹🇭 Thailand | |
| 2 | Kaeng Krachan National Park | 🇹🇭 Thailand | |
| 3 | Khao Yai National Park | 🇹🇭 Thailand |
With luck
About 10% of wildlife watchers report a Sapgreen stream frog sighting in Khao Yai National Park on a given day, based on 10 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 10th most-seen of the 13 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.
August
In that month about 40% of wildlife watchers report a Sapgreen stream frog in Khao Yai National Park on a given day, against under 5% in February, May, September and November–December, the lowest months. That is one of Khao Yai National Park's wettest months, with about 260 mm of rain against 15 mm in December.
Between 1 and 4 pm
Across all the parks we cover, that three-hour window holds the most Sapgreen stream 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.
3rd of 3
Of the 3 parks where we can rate Sapgreen stream frog sightings, Khao Yai National Park ranks 3rd at about 10%. The best odds are in Doi Inthanon National Park (Thailand, about 20%) and Kaeng Krachan National Park (Thailand, about 10%).
GBIF citizen-science records
It is estimated from how often the Sapgreen stream frog is recorded against all the amphibians logged in Khao Yai National Park (10 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.
