Fejervarya cancrivora
Silhouette: Jose Carlos Arenas-Monroy · PhyloPic
In 3 days ~60% in a week ~90%
The crab-eating frog (Fejervarya cancrivora) is a frog native to south-eastern Asia including Taiwan, China, Sumatra in Indonesia, the Philippines and more rarely as far west as Orissa in India. It has also been introduced to Guam, most likely from Taiwan. It inhabits mangrove swamps and marshes and is one of 144 known modern amphibians which can tolerate brief excursions into seawater, and is possibly the only extant marine amphibian.
This frog can tolerate marine environments (immersion in sea water for brief periods or brackish water for extended periods) by increasing urea production and retention, and by remaining slightly hyperosmotic within urea and sodium flux. Adults can survive in salt water with salinity as high as 2.8%, and tadpoles can survive salinities as high as 3.9%.
The food sources of the crab-eating frog are mainly determined by the locally available prey. Near fresh water, its diet consists largely of insects. But in an environment with brackish water, small crustaceans, including crabs, form the main part.
In Southeast Asia, the crab-eating frog is locally hunted for food and is often farmed for its edible legs, including in... Wikipedia →
Uncertain0:12
Singapore · 2026
© Joan Theng · XC1137281 · CC BY-NC-SA 4.0
Recording1:01
Singapore · 2024
© chugbug111 · iNaturalist · CC BY-NC 4.0
Recording0:14
Taiwan · 2022
© Edward Lin · iNaturalist · CC BY-NC 4.0
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Bako National Park | 🇲🇾 Malaysia | |
| 2 | Kinabatangan Wildlife Sanctuary | 🇲🇾 Malaysia |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Makassar | 🇮🇩 Indonesia | |
| 2 | Bandar Lampung | 🇮🇩 Indonesia | |
| 3 | Jakarta | 🇮🇩 Indonesia | |
| 4 | Tasikmalaya | 🇮🇩 Indonesia | |
| 5 | Singapore | 🇸🇬 Singapore |
Possible
About 30% of wildlife watchers report a Crab-eating Frog sighting in Bako National Park on a given day, based on 8 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 7th most-seen of the 11 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.
January, May and August
In those months about 40% of wildlife watchers report a Crab-eating Frog in Bako National Park on a given day, against under 5% in March–April, June–July and September–November, the lowest months.
Between 7 and 10 pm
Across all the parks we cover, that three-hour window holds the most Crab-eating Frog sightings with a recorded time, and about 9 in 10 of them come between 6 pm and 6 am: it is mostly seen at night.
Yes
Of the 2 parks where we can rate Crab-eating Frog sightings, Bako National Park has the highest daily chance: about 30%. Next come Kinabatangan Wildlife Sanctuary (Malaysia, about 20%).
Same order: Anura
The closest relatives of the Crab-eating Frog that you can see in Bako National Park (order Anura, Frogs and Toads) are Brown Marsh Frog (about 50%), Copper-cheeked Frog (about 50%) and Lowland Dwarf Toad (about 40%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Crab-eating Frog is recorded against all the amphibians logged in Bako National Park (8 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.
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