Coremacera marginata
In 3 days ~10% in a week ~20%
Coremacera marginata is a species of fly in the family Sciomyzidae, the marsh flies or snail-killing flies. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 2 | Cévennes National Park | 🇫🇷 France | |
| 3 | Wadden Sea National Park | 🇩🇪 Germany |
Rare
Under 5% of wildlife watchers report a Sieve-Winged Snailkiller sighting in Helsinki on a given day, based on 7 verified sightings from GBIF citizen-science data. It is the 602nd most-seen of the 838 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
July
In that month about 10% of wildlife watchers report a Sieve-Winged Snailkiller in Helsinki on a given day, against under 5% in August to June, the lowest months.
Between 2 and 5 pm
Across all the parks we cover, that three-hour window holds the most Sieve-Winged Snailkiller 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 7 cities where we can rate Sieve-Winged Snailkiller sightings, Helsinki has the highest daily chance: under 5%. Next come Kyiv (Ukraine, under 5%) and Berlin (Germany, under 5%).
GBIF citizen-science records
It is estimated from how often the Sieve-Winged Snailkiller is recorded against all the insects logged in Helsinki (7 verified sightings), 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.
