Polyommatus eros
In 3 days ~60% in a week ~90%
Polyommatus eros, the Eros blue or common meadow blue, is a species of blue butterfly found in the Palearctic. L. eros O. (= tithonus Hbn.) (80 c, d). male very bright blue, with a metallic gloss like enamel, black margin to the forewing and black distal-marginal spots to the hindwing, these spots contrasting strongly with the pure white fringes. Female brown, sometimes with yellowish red distal-marginal spots. Underside strongly recalling icarus, but male as well as female with distinct white median streak on the hindwing. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Hohe Tauern National Park | 🇦🇹 Austria | |
| 2 | Vanoise National Park | 🇫🇷 France | |
| 3 | Mercantour National Park | 🇫🇷 France | |
| 4 | Ecrins National Park | 🇫🇷 France | |
| 5 | Pyrénées National Park | 🇫🇷 France |
Possible
About 30% of wildlife watchers report an Eros Blue sighting in Hohe Tauern National Park on a given day, based on 35 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 15th most-seen of the 165 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.
July and August
In those months about 40% of wildlife watchers report an Eros Blue in Hohe Tauern National Park on a given day, against under 5% in February, April–June and September, the lowest months. December has too few records to rate.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Eros Blue 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 5 parks where we can rate Eros Blue sightings, Hohe Tauern National Park has the highest daily chance: about 30%. Next come Vanoise National Park (France, about 30%) and Mercantour National Park (France, about 20%).
Same family: Lycaenidae
The closest relatives of the Eros Blue that you can see in Hohe Tauern National Park (family Lycaenidae, Gossamer-winged Butterflies) are Scarce Copper (about 50%), Small Blue (about 30%) and Mazarine Blue (about 30%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Eros Blue is recorded against all the insects logged in Hohe Tauern National Park (35 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.
