Fejervarya kawamurai
In 3 days ~20% in a week ~30%
Fejervarya kawamurai is a species of frog in the family Dicroglossidae. It is endemic to Taiwan, Japan (Ryukyu Islands and Honshu), and China. It belongs to the Fejervarya limnocharis species complex. F. kawamurai is a relatively small species of paddy frog. Males have a snout-vent length of 36–41 mm, and females are slightly larger at 40–47 mm.
F. kawamurai is widespread species, ranging across central and eastern China, western Taiwan, much of South Korea, and, in Japan, the western part of Honshu, Shikoku, Kyushu, and the Ryukyu Islands, apart from the Sakishima Islands.
It has also recently invaded the Kanto region of Japan. Its presence there was first recorded in 1997, and it may have been accidentally introduced by way of imported soil or crop seeds. There is also speculation that global warming may be enabling its spread to previously unliveable areas.
This species is most commonly found in paddy fields, and rarely ventures into other habitats. This frog lays multiple clutches of eggs during breeding and its tadpoles undergo metamorphosis swiftly after hatching. F. kawamurai‘s breeding season... Wikipedia →
| # | Park | Country | Daily sighting probability |
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More parks will be added in future updates.
With luck
About 10% of wildlife watchers report a Rice field frog sighting in Tokyo on a given day, based on 42 verified sightings from GBIF citizen-science data. It is the 5th most-seen of the 11 amphibians we can rate there. Over three days the chance rises to about 20%, and over a week to about 30%, if each day is a fresh chance.
June to October
In those months about 10% of wildlife watchers report a Rice field frog in Tokyo on a given day, against under 5% in November to May, the lowest months.
Between 6 and 9 am
Across all the parks we cover, that three-hour window holds the most Rice field frog sightings with a recorded time, and about 7 in 10 of them come between 6 am and 6 pm: it is most active around dawn and dusk.
9th of 9
Of the 9 cities where we can rate Rice field frog sightings, Tokyo ranks 9th at about 10%. The best odds are in Nagoya (Japan, about 40%), Naha (Japan, about 20%) and Fukuoka (Japan, about 20%).
Same order: Anura
The closest relatives of the Rice field frog that you can see in Tokyo (order Anura, Frogs and Toads) are Japanese Toad (about 10%), American Bullfrog (about 10%) and Daruma Pond Frog (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Rice field frog is recorded against all the amphibians logged in Tokyo (42 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.
