Dryophytes japonicus
In 3 days ~50% in a week ~80%
Dryophytes japonicus, with frequently used synonym Hyla japonica, commonly known as the Japanese tree frog, is a species of anuran native to Japan, China, and Korea. It is unique in its ability to withstand extreme cold, with some individuals showing cold resistance at temperatures as low as −30 °C for up to 120 days. Japanese tree frogs are not currently facing any notable risk of extinction and are classified by the IUCN as a species of "least concern". Notably, it has been sent to space in a study that explored the effect of microgravity on Japanese tree frogs. Some consider that Dryophytes japonicus is synonymous with Hyla japonica. However, a 2025 study treated that this species as Dryophytes japonicus again, and separated northern species as Dryophytes leopardus.
The Japanese tree frog lives in a variety of habitats such as wetlands, forests, rivers, and mountains. They are generally located near vegetation near water sources and forests. They are carnivores that prey on insects and spiders. Their average clutch size is around 340–1,500 eggs, and their lifespan is usually around six years. There is an estimated 100 million of these frogs in Japan, but the accuracy is limited due to difficulty in counting. Wikipedia →
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| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Uminonakamichi Seaside Park | 🇯🇵 Japan | |
| 2 | Asahiyama Zoo | 🇯🇵 Japan | |
| 3 | Ueno Zoological Gardens (West Garden) | 🇯🇵 Japan |
Possible
About 20% of wildlife watchers report a Japanese Tree Frog sighting in Seoul on a given day, based on 175 verified sightings from GBIF citizen-science data. It is the most-seen of the 9 amphibians we can rate there. 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 Japanese Tree Frog in Seoul on a given day, against under 5% in December to March, the lowest months.
2nd of 2
Of the 2 cities where we can rate Japanese Tree Frog sightings, Seoul ranks 2nd at about 20%. The best odds are in Daegu (South Korea, about 40%).
Same order: Anura
The closest relatives of the Japanese Tree Frog that you can see in Seoul (order Anura, Frogs and Toads) are Black-spotted Frog (about 20%), Asiatic Toad (about 20%) and Boreal Digging Frog (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Japanese Tree Frog is recorded against all the amphibians logged in Seoul (175 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.
