Cyaniris semiargus
In 3 days ~40% in a week ~70%
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 |
With luck
About 10% of wildlife watchers report a Mazarine Blue sighting in Ecrins National Park on a given day, based on 19 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 61st most-seen of the 251 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.
May
In that month about 30% of wildlife watchers report a Mazarine Blue in Ecrins National Park on a given day, against under 5% in September–October and December–April, 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.
6th of 9
Of the 9 parks where we can rate Mazarine Blue sightings, Ecrins National Park ranks 6th at about 10%. The best odds are in Hohe Tauern National Park (Austria, about 30%), Mercantour National Park (France, about 30%) and Vanoise National Park (France, about 20%).
Same family: Lycaenidae
The closest relatives of the Mazarine Blue that you can see in Ecrins National Park (family Lycaenidae, Gossamer-winged Butterflies) are Scarce Copper (about 30%), Chalkhill Blue (about 30%) and Damon Blue (about 30%), 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 Ecrins National Park (19 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.
