Glaucopsyche alexis
In 3 days ~10% in a week ~30%
Glaucopsyche alexis, the green-underside blue, is a butterfly of the family Lycaenidae. It is found in the Palearctic. The butterfly flies from April to July depending on the location, lingering in warm, lush meadows with plenty of its host plant, vetch (Vicia).
Male above light cyaneous blue with a violet sheen and narrow black border; female darker blue with the black border gradually shading off, so that it occupies nearly the whole outer half of the wings. Beneath silver-grey (male) or ashy grey (female), the forewing with 5 or 6 large rounded black spots, the hindwing with small ocelli and in its whole basal half with metallic blue-green dusting. In ab. dimus Bgstr. the ocelli of the forewing beneath are reduced to 4; on the other hand, they may also be increased in number, or may be elongate (= subtus-radiata Oberth.). In European Turkey and the neighbouring districts of Anterior Asia the ocelli of... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Mercantour National Park | 🇫🇷 France | |
| 2 | Cévennes National Park | 🇫🇷 France | |
| 3 | Pyrénées National Park | 🇫🇷 France | |
| 4 | Sierra de Guadarrama National Park | 🇪🇸 Spain | |
| 5 | Bavarian Forest National Park | 🇩🇪 Germany |
Rare
Under 5% of wildlife watchers report a Green-Underside Blue sighting in Stockholm on a given day, based on 5 verified sightings from GBIF citizen-science data. It is the 175th most-seen of the 202 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.
June
In that month about 10% of wildlife watchers report a Green-Underside Blue in Stockholm on a given day, against under 5% in July to May, the lowest months. That is one of Stockholm's wettest months, with about 80 mm of rain against 35 mm in April.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Green-Underside 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 7
Of the 7 cities where we can rate Green-Underside Blue sightings, Stockholm ranks 6th at under 5%. The best odds are in Budapest (Hungary, about 10%), Madrid (Spain, about 10%) and Istanbul (Turkey, about 10%).
Same family: Lycaenidae
The closest relatives of the Green-Underside Blue that you can see in Stockholm (family Lycaenidae, Gossamer-winged Butterflies) are Green Hairstreak (about 10%), Small Copper (about 10%) and Common Blue (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Green-Underside Blue is recorded against all the insects logged in Stockholm (5 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.
