Pelophylax nigromaculatus
Silhouette: Beth Reinke · PhyloPic
In 3 days ~20% in a week ~50%
Pelophylax nigromaculatus (formerly Rana nigromaculata), is a species of true frog found in East Asia, first described in 1861. This widespread and common frog has many common names, including dark-spotted frog, black-spotted pond frog, and black-spotted frog.
It occurs across much of mainland eastern-northeastern China, the Amur River valley in Russia, the Korean Peninsula (including Ulleungdo Island), and most of Japan, with exceptions of Hokkaidō and the Ryukyu Islands. It has been considered the most-common of the true frogs on the Korean Peninsula, and has been hunted for food there for centuries, and, in modern times, used as an experimental animal. There are also introduced populations in Turkmenistan, Oahu, and Saipan.
The dark-spotted frog is a relatively low-altitude species, not being found above 2200 m. It ranges across a variety of habitats, from deserts and bushland to meadows and forests, and is typically found in or near stagnant or slow-moving water. Although relatively tolerant of human interference, it is increasingly threatened by hunting and water pollution.
Adult males measure about 62 mm (2.4 in) and females 74... Wikipedia →
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| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Animals Asia | 🇨🇳 China | |
| 2 | Cube Oceanarium | 🇨🇳 China |
With luck
About 10% of wildlife watchers report a Black-spotted Frog sighting in Osaka on a given day, based on 17 verified sightings from GBIF citizen-science data. It is the 4th most-seen of the 8 amphibians we can rate there. Over three days the chance rises to about 20%, and over a week to about 50%, if each day is a fresh chance.
June and August
In those months about 20% of wildlife watchers report a Black-spotted Frog in Osaka on a given day, against under 5% in October to April, the lowest months.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Black-spotted Frog sightings with a recorded time, and about 7 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
15th of 17
Of the 17 cities where we can rate Black-spotted Frog sightings, Osaka ranks 15th at about 10%. The best odds are in Daegu (South Korea, about 50%), Tianjin (China, about 40%) and Nagoya (Japan, about 20%).
Same family: Ranidae
The closest relatives of the Black-spotted Frog that you can see in Osaka (family Ranidae, Typical Frogs) are American Bullfrog (about 20%), Wrinkled Frog (about 10%) and Japanese Brown Frog (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Black-spotted Frog is recorded against all the amphibians logged in Osaka (17 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.
