Bibio pomonae
In 3 days ~10% in a week ~30%
Bibio pomonae, common name red-thighed St Mark's fly or heather fly, is a species of fly (Diptera) belonging to the family Bibionidae. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Tatra National Park | 🇸🇰 Slovakia | |
| 2 | Snowdonia National Park | 🇬🇧 United Kingdom | |
| 3 | Cairngorms National Park | 🇬🇧 United Kingdom | |
| 4 | Pyrénées National Park | 🇫🇷 France |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Manchester | 🇬🇧 United Kingdom |
Rare
Under 5% of wildlife watchers report a Red-Thighed St Mark's Fly sighting in Pyrénées National Park on a given day, based on 12 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 657th most-seen of the 1277 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.
July and August
In those months about 10% of wildlife watchers report a Red-Thighed St Mark's Fly in Pyrénées National Park on a given day, against under 5% in September to June, the lowest months.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Red-Thighed St Mark's Fly sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
4th of 4
Of the 4 parks where we can rate Red-Thighed St Mark's Fly sightings, Pyrénées National Park ranks 4th at under 5%. The best odds are in Tatra National Park (Slovakia, about 10%), Snowdonia National Park (United Kingdom, about 10%) and Cairngorms National Park (United Kingdom, about 10%).
Same order: Diptera
The closest relatives of the Red-Thighed St Mark's Fly that you can see in Pyrénées National Park (order Diptera, Flies) are Common Drone Fly (about 10%), Tapered Drone Fly (about 10%) and Beech Gall Midge (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Red-Thighed St Mark's Fly is recorded against all the insects logged in Pyrénées National Park (12 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.
