Chalcorana megalonesa
Silhouette: Michael Scroggie, from original photograph by John Bettaso, USFWS (original photograph in public domain). · PhyloPic
In 3 days ~30% in a week ~50%
Chalcorana megalonesa is a species of true frog in the family Ranidae, the "true frogs". It is endemic to Borneo and is known from both Malaysia (Sarawak, Sabah) and Indonesia (Kalimantan). It was split off from Rana chalconota (now Chalcorana chalconota) in 2009 by Robert Inger and colleagues, along with a number of other species. Common name large white-lipped frog has been coined for it.
Chalcorana megalonesa are moderately large-sized frogs: adult males measure 33–48 mm (1.3–1.9 in) and females 45–66 mm (1.8–2.6 in) in snout–vent length. Body is moderately slender and legs are long. Dorsum is weakly granular. Colouration is mostly green. The snout is long and pointed. Finger and toe tips have adhesive disks. It is very similar to Chalcorana raniceps in colouration and general body shape but is clearly bigger in size.
Chalcorana megalonesa occurs in tropical moist lowland and swamp forest at elevations of 20–600 m (66–1,969 ft) above sea level. Breeding takes place in small, permanent ponds (usually >30 cm deep). It can also be found in oil palm and forest concessions and appears to tolerate habitat disturbance. However, the use of pesticides and herbicides... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Kinabatangan Wildlife Sanctuary | 🇲🇾 Malaysia | |
| 2 | Sepilok | 🇲🇾 Malaysia |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Jakarta | 🇮🇩 Indonesia |
With luck
About 10% of wildlife watchers report a Large White-lipped Frog sighting in Sepilok on a given day, based on 12 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 16th most-seen of the 18 amphibians we can rate there. Over three days the chance rises to about 30%, and over a week to about 50%, if each day is a fresh chance.
February, April and August
In those months about 20% of wildlife watchers report a Large White-lipped Frog in Sepilok on a given day, against under 5% in March, May–June and September–January, the lowest months.
Between 1 and 4 pm
Across all the parks we cover, that three-hour window holds the most Large White-lipped 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.
2nd of 2
Of the 2 parks where we can rate Large White-lipped Frog sightings, Sepilok ranks 2nd at about 10%. The best odds are in Kinabatangan Wildlife Sanctuary (Malaysia, about 20%).
GBIF citizen-science records
It is estimated from how often the Large White-lipped Frog is recorded against all the amphibians logged in Sepilok (12 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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