Bibio pomonae
In 3 days ~30% in a week ~60%
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 |
With luck
About 10% of wildlife watchers report a Red-Thighed St Mark's Fly sighting in Tatra National Park on a given day, based on 10 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 74th most-seen of the 142 insects we can rate there. Over three days the chance rises to about 30%, and over a week to about 60%, if each day is a fresh chance.
August
In that month about 30% of wildlife watchers report a Red-Thighed St Mark's Fly in Tatra 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.
Yes
Of the 4 parks where we can rate Red-Thighed St Mark's Fly sightings, Tatra National Park has the highest daily chance: about 10%. Next come 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 Tatra National Park (order Diptera, Flies) are Common Drone Fly (about 40%), Marmalade Hover Fly (about 20%) and Pellucid Hover Fly (about 20%), 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 Tatra National Park (10 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.
