Boloria dia
In 3 days ~50% in a week ~80%
Boloria dia, the Weaver's fritillary or violet fritillary, is a butterfly in the family Nymphalidae. The name Weaver's fritillary is in honor of Richard Weaver, an English insect collector who claimed to have obtained the specimen within ten miles of Birmingham around 1820. However, B. dia is very rare in England and the few specimens known from there are thought to be from possibly accidental introductions.
The adult is a small fritillary with typically chequered orange-brown upperside and a submarginal row of triangles and dots. The forewing is 16–17 mm long. The underside of the hindwing has a distinctive purplish band. A. dia L. (68f) is the smallest Argynnis. Above usually more extended black than the other species; the basal area of the hindwing as a rule quite dark, the marginal area with a row of heavy black dots. The hindwing beneath variegated with purple and bearing silvery spots at the margin, in the median band and at the base.
Throughout Central, North and East Europe, also in Anterior Asia eastwards to Mongolia. Specimens with a broad confluent median band are ab. vittata Spul. (= mediofasciata Schultz). In ab. hudaki Aign... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Picos de Europa National Park | 🇪🇸 Spain | |
| 2 | Aigüestortes National Park | 🇪🇸 Spain | |
| 3 | Pyrénées National Park | 🇫🇷 France | |
| 4 | Cévennes National Park | 🇫🇷 France | |
| 5 | Ecrins National Park | 🇫🇷 France | |
| 6 | Triglav National Park | 🇸🇮 Slovenia | |
| 7 | Mercantour National Park | 🇫🇷 France | |
| 8 | Bavarian Forest National Park | 🇩🇪 Germany |
Possible
About 20% of wildlife watchers report a Weaver's Fritillary sighting in Aigüestortes National Park on a given day, based on 13 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 105th most-seen of the 256 insects we can rate there. Over three days the chance rises to about 50%, and over a week to about 80%, if each day is a fresh chance.
July
In that month about 30% of wildlife watchers report a Weaver's Fritillary in Aigüestortes National Park on a given day, against under 5% in February–June and September–December, the lowest months.
Between 2 and 5 pm
Across all the parks we cover, that three-hour window holds the most Weaver's 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 8 parks where we can rate Weaver's Fritillary sightings, Aigüestortes National Park ranks 2nd at about 20%, level with the leaders once rounded. The best odds are in Picos de Europa National Park (Spain, about 20%).
GBIF citizen-science records
It is estimated from how often the Weaver's Fritillary is recorded against all the insects logged in Aigüestortes National Park (13 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.
