Arhopala japonica
In 3 days ~40% in a week ~70%
Arhopala japonica, the Japanese oakblue, is a species of butterfly in the family Lycaenidae. It is found in Indochina, Japan, the Ryukyu Islands, the Korean Peninsula and Taiwan. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Taroko National Park | 🇹🇼 Taiwan |
More parks will be added in future updates.
Possible
About 20% of wildlife watchers report a Japanese Oakblue sighting in Nagoya on a given day, based on 12 verified sightings from GBIF citizen-science data. It is the 90th most-seen of the 195 insects we can rate there. Over three days the chance rises to about 40%, and over a week to about 70%, if each day is a fresh chance.
December and January
In those months about 30% of wildlife watchers report a Japanese Oakblue in Nagoya on a given day, against under 5% in February–March, May and October–November, the lowest months. Those are among Nagoya's driest months, with about 75 mm of rain a month against 230 mm in July.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Japanese Oakblue sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 4 cities where we can rate Japanese Oakblue sightings, Nagoya has the highest daily chance: about 20%. Next come Osaka (Japan, about 10%) and Tokyo (Japan, about 10%).
Same family: Lycaenidae
The closest relatives of the Japanese Oakblue that you can see in Nagoya (family Lycaenidae, Gossamer-winged Butterflies) are Pale Grass Blue (about 40%), Small Copper (about 30%) and Short-Tailed Blue (about 30%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Japanese Oakblue is recorded against all the insects logged in Nagoya (12 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.
