Plebejus argyrognomon
In 3 days ~10% in a week ~30%
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.
Rare
Under 5% of wildlife watchers report a Reverdin's Blue sighting in Lyon on a given day, based on 6 verified sightings from GBIF citizen-science data. It is the 318th most-seen of the 411 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
May–June and August–October
In those months about 10% of wildlife watchers report a Reverdin's Blue in Lyon on a given day, against under 5% in July and November–April, the lowest months.
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.
5th of 6
Of the 6 cities where we can rate Reverdin's Blue sightings, Lyon ranks 5th at under 5%. The best odds are in Daegu (South Korea, about 20%), Beijing (China, about 10%) and Budapest (Hungary, about 10%).
Same family: Lycaenidae
The closest relatives of the Reverdin's Blue that you can see in Lyon (family Lycaenidae, Gossamer-winged Butterflies) are Common Blue (about 20%), Geranium Bronze (about 20%) and Small Copper (about 20%), 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 Lyon (6 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.
