Anotogaster sieboldii
In 3 days ~50% in a week ~80%
Anotogaster sieboldii, as known as golden-ringed dragonfly, jumbo dragonfly, Siebold's dragonfly or oniyanma (オニヤンマ、鬼蜻蜓、馬大頭) in Japanese, 無霸勾蜓 in Chinese and 장수잠자리 ("jang-su-jamjari", means 'General Dragonfly') in Korean is the largest species of dragonfly native to Eastern Asia, especially Japan, Taiwan, China, Korean Peninsula. It can grow between 95 and 100 mm in length. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Nikko National Park | 🇯🇵 Japan |
More parks will be added in future updates.
Possible
About 20% of wildlife watchers report a Jumbo Dragonfly sighting in Nikko National Park on a given day, based on 7 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 22nd most-seen of the 86 insects 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.
August
In that month about 40% of wildlife watchers report a Jumbo Dragonfly in Nikko National Park on a given day, against under 5% in March–June and October–November, the lowest months. That is one of Nikko National Park's wettest months, with about 230 mm of rain against 100 mm in November.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Jumbo Dragonfly sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only Nikko National Park, in our data
Nikko National Park is the only park on Wallace's Line with enough records to rate Jumbo Dragonfly sightings: about 20% of wildlife watchers there report one on a given day.
Same order: Odonata
The closest relatives of the Jumbo Dragonfly that you can see in Nikko National Park (order Odonata, Dragonflies and Damselflies) are Autumn Darter (about 50%) and Orthetrum japonicum (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Jumbo Dragonfly is recorded against all the insects logged in Nikko National Park (7 verified sightings from 2019 to 2026), 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.
