Boloria selene
In 3 days ~40% in a week ~70%
Boloria selene, known in Europe as the small pearl-bordered fritillary, is a species of butterfly of the family Nymphalidae. It is found across Europe, Asia and North America, and feeds exclusively on violets in its larval stages. This species prefers wet grassland habitats, where its larval food source, violets, are found. It overwinters in its larval stage, and eggs hatch in the late summer to early autumn. Members of this species are prey for multiple types of birds and other insects.
Due to modern agriculture, most of the grassland habitats that sustain Boloria selene are fragmented or lost all together in favor of farmland. Because of this, the small pearl-bordered fritillary has seen a serious drop in population across Europe, in some places as much as 80%. Factors including limited habitat range, low dispersal rate, and strong food specialization also contribute to population loss. Despite modern conservation efforts, the number of small pearl-bordered fritillaries is still declining. The North American populations appear to be affected in the same way, at least in the continental United States.
The small pearl-bordered fritillary is similar to the pearl-bordered... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cairngorms National Park | 🇬🇧 United Kingdom | |
| 2 | Picos de Europa National Park | 🇪🇸 Spain | |
| 3 | Aigüestortes National Park | 🇪🇸 Spain | |
| 4 | Hohe Tauern National Park | 🇦🇹 Austria | |
| 5 | Pyrénées National Park | 🇫🇷 France | |
| 6 | Snowdonia National Park | 🇬🇧 United Kingdom | |
| 7 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 8 | Cévennes National Park | 🇫🇷 France | |
| 9 | Wadden Sea National Park | 🇩🇪 Germany |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Moscow | 🇷🇺 Russia |
Possible
About 20% of wildlife watchers report a Eurasian Silver-Bordered Fritillary sighting in Aigüestortes National Park on a given day, based on 18 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 140th most-seen of the 256 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.
July
In that month about 30% of wildlife watchers report a Eurasian Silver-Bordered Fritillary in Aigüestortes National Park on a given day, against under 5% in February–May and August–December, the lowest months.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Eurasian Silver-Bordered Fritillary sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 9 parks where we can rate Eurasian Silver-Bordered Fritillary sightings, Aigüestortes National Park ranks 3rd at about 20%, level with the leaders once rounded. The best odds are in Cairngorms National Park (United Kingdom, about 20%) and Picos de Europa National Park (Spain, about 20%).
GBIF citizen-science records
It is estimated from how often the Eurasian Silver-Bordered Fritillary is recorded against all the insects logged in Aigüestortes National Park (18 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.
