Lethe diana
In 3 days ~60% in a week ~90%
Lethe diana, the Diana treebrown, is a brush-footed butterfly (subfamily Satyrinae) in the family Nymphalidae. Its wings are a dark shade of brown, with an eyespot pattern, and a wingspan of about 45–55 mm. It resembles Lethe confusa; however, the Lethe confusa bears a white band on its wings, setting them apart. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Nikko National Park | 🇯🇵 Japan |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Tokyo | 🇯🇵 Japan |
Possible
About 30% of wildlife watchers report a Diana Treebrown sighting in Nikko National Park on a given day, based on 15 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 7th most-seen of the 86 insects we can rate there. Over three days the chance rises to about 60%, and over a week to about 90%, if each day is a fresh chance.
July to September
In those months about 40% of wildlife watchers report a Diana Treebrown in Nikko National Park on a given day, against under 5% in March–April and October–November, the lowest months.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Diana Treebrown 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 Diana Treebrown sightings: about 30% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Diana Treebrown is recorded against all the insects logged in Nikko National Park (15 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.
