Cyaniris semiargus
In 3 days ~60% in a week ~90%
Cyaniris semiargus, the Mazarine blue, is a Palearctic butterfly in the family Lycaenidae. There was a large native population in Britain in the early part of the 19th century, but it disappeared before the 20th century, though single vagrants have been spotted, and some estimates of British resident extinction... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Hohe Tauern National Park | 🇦🇹 Austria | |
| 2 | Mercantour National Park | 🇫🇷 France | |
| 3 | Vanoise National Park | 🇫🇷 France | |
| 4 | Aigüestortes National Park | 🇪🇸 Spain | |
| 5 | Triglav National Park | 🇸🇮 Slovenia | |
| 6 | Ecrins National Park | 🇫🇷 France | |
| 7 | Pyrénées National Park | 🇫🇷 France | |
| 8 | Cévennes National Park | 🇫🇷 France | |
| 9 | Sierra de Guadarrama National Park | 🇪🇸 Spain |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Novosibirsk | 🇷🇺 Russia | |
| 2 | Helsinki | 🇫🇮 Finland | |
| 3 | Moscow | 🇷🇺 Russia | |
| 4 | Munich | 🇩🇪 Germany | |
| 5 | Saint Petersburg | 🇷🇺 Russia |
Possible
About 20% of wildlife watchers report a Mazarine Blue sighting in Vanoise National Park on a given day, based on 30 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 34th most-seen of the 308 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.
June
In that month about 40% of wildlife watchers report a Mazarine Blue in Vanoise National Park on a given day, against under 5% in September–October and December–May, the lowest months.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Mazarine Blue sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
3rd of 9
Of the 9 parks where we can rate Mazarine Blue sightings, Vanoise National Park ranks 3rd at about 20%. The best odds are in Hohe Tauern National Park (Austria, about 30%) and Mercantour National Park (France, about 30%).
Same family: Lycaenidae
The closest relatives of the Mazarine Blue that you can see in Vanoise National Park (family Lycaenidae, Gossamer-winged Butterflies) are Scarce Copper (about 40%), Damon Blue (about 40%) and Chalkhill Blue (about 40%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Mazarine Blue is recorded against all the insects logged in Vanoise National Park (30 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.
