Boloria selene
In 3 days ~10% in a week ~20%
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 |
Rare
Under 5% of wildlife watchers report a Eurasian Silver-Bordered Fritillary sighting in Moscow on a given day, based on 10 verified sightings from GBIF citizen-science data. It is the 677th most-seen of the 1111 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Eurasian Silver-Bordered Fritillary in Moscow on a given day, so our monthly data shows no clear season.
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.
Only Moscow, in our data
Moscow is the only city on Wallace's Line with enough records to rate Eurasian Silver-Bordered Fritillary sightings: under 5% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Eurasian Silver-Bordered Fritillary is recorded against all the insects logged in Moscow (10 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.
