Rivellia syngenesiae
In 3 days ~20% in a week ~40%
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Snowdonia National Park | 🇬🇧 United Kingdom | |
| 2 | Wadden Sea National Park | 🇩🇪 Germany |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Porto | 🇵🇹 Portugal |
With luck
About 10% of wildlife watchers report a Rivellia syngenesiae sighting in Snowdonia National Park on a given day, based on 8 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 264th most-seen of the 387 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
June
In that month about 20% of wildlife watchers report a Rivellia syngenesiae in Snowdonia National Park on a given day, against under 5% in August to April, the lowest months.
Between 3 and 6 pm
Across all the parks we cover, that three-hour window holds the most Rivellia syngenesiae sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 2 parks where we can rate Rivellia syngenesiae sightings, Snowdonia National Park has the highest daily chance: about 10%. Next come Wadden Sea National Park (Germany, under 5%).
Same order: Diptera
The closest relatives of the Rivellia syngenesiae that you can see in Snowdonia National Park (order Diptera, Flies) are Tapered Drone Fly (about 20%), Marmalade Hover Fly (about 20%) and Dark Giant Horse Fly (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Rivellia syngenesiae is recorded against all the insects logged in Snowdonia National Park (8 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.
