Buergeria buergeri
Silhouette: Jose Carlos Arenas-Monroy · PhyloPic
In 3 days ~10% in a week ~30%
The Kajika frog or Buerger's frog (Buergeria buergeri) is a species of frog in the family Rhacophoridae. It is endemic to Japan where it can be found on Honshu, Kyushu, and Shikoku islands. It is locally threatened by habitat loss caused by dam building and construction of concrete riverbanks.
As with other species in the family Rhacophoridae, the female is bigger than the male. Males are 3.5–4.4 cm and females are 4.9–8.5 cm. Their bodies are flat which allows them to easily hide between rocks. They are grayish-brown in color with speckles which makes for protective camouflage on rocks. There is a dark T-shaped pattern between their eyes. They are able to change their shade of color to a certain extent based on their surroundings. There isn't much individual variance in color. Suction pads grow on the tips of their fingers and toes. Their eggs are dark brown with a diameter of 0.2 cm. Their mouths are big and have suction pads that allow them to cling onto rocks in a strong current in order to not get carried away.
They live in montane streams, lakes, and the surrounding forests. Their diet consists of insects and spiders. The tadpoles eat algae. The... Wikipedia →
Recording0:07
Japan · 2025
© taiwan_habu · iNaturalist · CC BY-NC 4.0
Recording0:18
Japan · 2025
© satokeiji · iNaturalist · CC BY-NC 4.0
Recording0:04
Japan · 2023
© mami_t_t · iNaturalist · CC BY 4.0
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Nikko National Park | 🇯🇵 Japan |
More parks will be added in future updates.
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Ueno Zoological Gardens (West Garden) | 🇯🇵 Japan |
Rare
Under 5% of wildlife watchers report a Kajika Frog sighting in Tokyo on a given day, based on 22 verified sightings from GBIF citizen-science data. It is the 7th most-seen of the 11 amphibians we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
April–June and August–September
In those months about 10% of wildlife watchers report a Kajika Frog in Tokyo on a given day, against under 5% in July and October–March, the lowest months.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Kajika Frog sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
2nd of 2
Of the 2 cities where we can rate Kajika Frog sightings, Tokyo ranks 2nd at under 5%. The best odds are in Sendai (Japan, about 10%).
GBIF citizen-science records
It is estimated from how often the Kajika Frog is recorded against all the amphibians logged in Tokyo (22 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.
