Lysandra coridon
In 3 days ~70% in a week ~90%
The chalkhill blue (Lysandra coridon) is a butterfly in the family Lycaenidae. It is a small butterfly that can be found throughout the Palearctic realm, where it occurs primarily in grasslands rich in chalk. Males have a pale blue colour, while females are brown. Both have chequered fringes around their wings.
As with many blue butterflies, separation from similar species in the field is on the underside markings... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Triglav National Park | 🇸🇮 Slovenia | |
| 2 | Vanoise National Park | 🇫🇷 France | |
| 3 | Aigüestortes National Park | 🇪🇸 Spain | |
| 4 | Mercantour National Park | 🇫🇷 France | |
| 5 | Picos de Europa National Park | 🇪🇸 Spain | |
| 6 | Ordesa y Monte Perdido National Park | 🇪🇸 Spain | |
| 7 | Ecrins National Park | 🇫🇷 France | |
| 8 | Pyrénées National Park | 🇫🇷 France | |
| 9 | Hohe Tauern National Park | 🇦🇹 Austria | |
| 10 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 11 | Cévennes National Park | 🇫🇷 France |
Possible
About 30% of wildlife watchers report a Chalkhill Blue sighting in Picos de Europa National Park on a given day, based on 48 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 8th most-seen of the 118 insects we can rate there. Over three days the chance rises to about 70%, and over a week to about 90%, if each day is a fresh chance.
August
In that month about 60% of wildlife watchers report a Chalkhill Blue in Picos de Europa National Park on a given day, against under 5% in March–June and October–November, the lowest months. That is one of Picos de Europa National Park's driest months, with about 75 mm of rain against 220 mm in November.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Chalkhill 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.
5th of 11
Of the 11 parks where we can rate Chalkhill Blue sightings, Picos de Europa National Park ranks 5th at about 30%. The best odds are in Triglav National Park (Slovenia, about 40%), Vanoise National Park (France, about 40%) and Aigüestortes National Park (Spain, about 40%).
GBIF citizen-science records
It is estimated from how often the Chalkhill Blue is recorded against all the insects logged in Picos de Europa National Park (48 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.
