Tachina grossa
In 3 days ~30% in a week ~50%
Tachina grossa is a very large tachinid fly. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cairngorms National Park | 🇬🇧 United Kingdom | |
| 2 | Snowdonia National Park | 🇬🇧 United Kingdom | |
| 3 | Cévennes National Park | 🇫🇷 France | |
| 4 | Pyrénées National Park | 🇫🇷 France | |
| 5 | Wadden Sea National Park | 🇩🇪 Germany |
With luck
About 10% of wildlife watchers report a Yellow-Faced Fly sighting in Cairngorms National Park on a given day, based on 18 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 94th most-seen of the 300 insects we can rate there. Over three days the chance rises to about 30%, and over a week to about 50%, if each day is a fresh chance.
July
In that month about 20% of wildlife watchers report a Yellow-Faced Fly in Cairngorms 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 Yellow-Faced 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 5 parks where we can rate Yellow-Faced Fly sightings, Cairngorms National Park has the highest daily chance: about 10%. Next come Snowdonia National Park (United Kingdom, about 10%) and Cévennes National Park (France, about 10%).
Same family: Tachinidae
The closest relatives of the Yellow-Faced Fly that you can see in Cairngorms National Park (family Tachinidae, Tachinid Flies) are Red Spotted Parasite Fly (about 10%) and Phasia hemiptera (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Yellow-Faced Fly is recorded against all the insects logged in Cairngorms 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.
