Phrynoidis asper
Silhouette: Michael Scroggie, from original photograph by Gary M. Stolz, USFWS (original photograph in public domain). · PhyloPic
In 3 days ~80% in a week >90%
The Asian giant toad (Phrynoidis asper), sometimes referred to as the river toad, is a species of true toad native to Mainland Southeast Asia and the Greater Sundas. It is a medium-large toad, but it is easily confused with its larger relative, the giant river toad (P. juxtasper).
Phrynoidis asper is generally a dark grey, green, black or brown in color, and is heavily covered in tubercles. Females can reach up to 14 cm (5.5 in) in snout–to–vent length and males up to 10 cm (3.9 in). They can be commonly found near stream and rivers.
"Bufo asper". Integrated Taxonomic Information System. Retrieved 19 March 2006. Frogs of the Malay Peninsula: Bufo asper Wikipedia →
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Malaysia · 2014
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2023
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Indonesia · 2020
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| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Khao Luang National Park | 🇹🇭 Thailand | |
| 2 | Khao Sok National Park | 🇹🇭 Thailand | |
| 3 | Gunung Leuser National Park | 🇮🇩 Indonesia |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Malang | 🇮🇩 Indonesia | |
| 2 | Jakarta | 🇮🇩 Indonesia | |
| 3 | Tasikmalaya | 🇮🇩 Indonesia | |
| 4 | Bandung | 🇮🇩 Indonesia |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | San Diego Zoo | 🇺🇸 United States | |
| 2 | California Academy of Sciences | 🇺🇸 United States | |
| 3 | Omaha’s Henry Doorly Zoo and Aquarium | 🇺🇸 United States | |
| 4 | Chester Zoo | 🇬🇧 United Kingdom | |
| 5 | Birmingham Zoo | 🇺🇸 United States | |
| 6 | Night Safari | 🇸🇬 Singapore | |
| 7 | Singapore Zoo | 🇸🇬 Singapore | |
| 8 | Entopia | 🇲🇾 Malaysia |
Likely
About 40% of wildlife watchers report a River Toad sighting in Gunung Leuser National Park on a given day, based on 36 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the most-seen of the 11 amphibians we can rate there. Over three days the chance rises to about 80%, and over a week to over 90%, if each day is a fresh chance.
May–July and November
In those months about 50% of wildlife watchers report a River Toad in Gunung Leuser National Park on a given day, against under 5% in August–September and December, the lowest months.
Between 2 and 5 pm
Across all the parks we cover, that three-hour window holds the most River Toad sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 3 parks where we can rate River Toad sightings, Gunung Leuser National Park ranks 3rd at about 40%, level with the leaders once rounded. The best odds are in Khao Luang National Park (Thailand, about 40%) and Khao Sok National Park (Thailand, about 40%).
GBIF citizen-science records
It is estimated from how often the River Toad is recorded against all the amphibians logged in Gunung Leuser National Park (36 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.
