Plebejus argyrognomon
In 3 days ~20% in a week ~40%
Plebejus argyrognomon, common name Reverdin's blue is a butterfly of the family Lycaenidae. The species is named after Jacques-Louis Reverdin. In Japan the species is found in agricultural areas. These butterflies inhabit grassy flowery places at an elevation of 200–1,500 metres (660–4,920 ft) above sea level. Plebejus argyrognomon has a wingspan of 28–34 mm. These small butterflies present a sexual dimorphism. The... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Bavarian Forest National Park | 🇩🇪 Germany |
More parks will be added in future updates.
With luck
About 10% of wildlife watchers report a Reverdin's Blue sighting in Beijing on a given day, based on 39 verified sightings from GBIF citizen-science data. It is the 77th most-seen of the 401 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
May to October
In those months about 10% of wildlife watchers report a Reverdin's Blue in Beijing on a given day, against under 5% in November to April, the lowest months. Those are among Beijing's wettest months, with about 80 mm of rain a month against almost none in January.
Between 4 and 7 pm
Across all the parks we cover, that three-hour window holds the most Reverdin's Blue sightings with a recorded time, and about 6 in 10 of them come between 6 am and 6 pm: it is most active around dawn and dusk.
2nd of 6
Of the 6 cities where we can rate Reverdin's Blue sightings, Beijing ranks 2nd at about 10%. The best odds are in Daegu (South Korea, about 20%).
Same family: Lycaenidae
The closest relatives of the Reverdin's Blue that you can see in Beijing (family Lycaenidae, Gossamer-winged Butterflies) are Short-Tailed Blue (about 10%), Tongeia filicaudis (about 10%) and Common Flash (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Reverdin's Blue is recorded against all the insects logged in Beijing (39 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.
