Kaloula borealis
In 3 days ~50% in a week ~80%
The boreal digging frog (Kaloula borealis) is a species of microhylid, or "narrow-mouthed," frog found in Northeast Asia. Its range covers much of central and northeastern China, the Korean Peninsula, and Jeju Island. Adult boreal digging frogs are roughly 4.5 cm in length, round in shape with toad-like speckled skin. Tadpoles are up to 35 mm (1.4 in) in length.
The boreal digging frog is common across much of its range, but is listed as an "Endangered category II species" in South Korea. It inhabits cultivated fields, including rice paddies, and is often found in close proximity to humanity, at altitudes of 10 to 900 m.
Boreal digging frogs breed during the annual rainy season, around June and July. After the rainy season is over they dig burrows underground, emerging only at night to feed. The eggs are laid in batches of 15–20 in monsoonal pools, with the tadpoles maturing within 30 days, much faster than most other frogs in this area. Wikipedia →
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China · 2026
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China · 2025
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South Korea · 2026
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| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Zoológico La Era de las aves | 🇪🇸 Spain |
Possible
About 20% of wildlife watchers report a Boreal Digging Frog sighting in Daejeon on a given day, based on 5 verified sightings from GBIF citizen-science data. Over three days the chance rises to about 50%, and over a week to about 80%, if each day is a fresh chance.
June
In that month about 40% of wildlife watchers report a Boreal Digging Frog in Daejeon on a given day, against under 5% in August to April, the lowest months.
Among the best
Of the 6 cities where we can rate Boreal Digging Frog sightings, Daejeon ranks 2nd at about 20%, level with the leaders once rounded. The best odds are in Nanjing (China, about 20%).
GBIF citizen-science records
It is estimated from how often the Boreal Digging Frog is recorded against all the amphibians logged in Daejeon (5 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.
