Sympetrum frequens
In 3 days ~80% in a week >90%
Sympetrum frequens, the Autumn darter (アキアカネ, akiakane), is a species of dragonfly endemic to Japan. It lives near grasslands and can grow up to 40 mm in length. After emerging, these dragonflies migrate to high mountains where they feed until descending to breeding pools (often temporary or artificial, including rice fields) at lower levels.
Akatombo—beloved Japanese song about this dragonfly ふしぎがわかる しぜん図鑑 こんちゅう (in Japanese). Tokyo, Japan: Froebel-Kan CO., LTD. 1999. p. 36. ISBN 4-577-00033-4. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Nikko National Park | 🇯🇵 Japan |
More parks will be added in future updates.
Likely
About 50% of wildlife watchers report an Autumn Darter sighting in Nikko National Park on a given day, based on 44 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the most-seen of the 86 insects we can rate there. Over three days the chance rises to about 80%, and over a week to over 90%, if each day is a fresh chance.
August
In that month about 80% of wildlife watchers report an Autumn Darter in Nikko National Park on a given day, against under 5% in April–May and 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 1 and 4 pm
Across all the parks we cover, that three-hour window holds the most Autumn Darter 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 Autumn Darter sightings: about 50% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Autumn Darter is recorded against all the insects logged in Nikko National Park (44 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.
