Helophilus affinis
In 3 days ~10% in a week ~20%
Helophilus affinis is a European species of hoverfly. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Migrant Marsh Fly sighting in Helsinki on a given day, based on 5 verified sightings from GBIF citizen-science data. It is the 732nd 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.
August
In that month about 10% of wildlife watchers report a Migrant Marsh Fly in Helsinki on a given day, against under 5% in September to July, the lowest months.
Yes
Of the 2 cities where we can rate Migrant Marsh Fly sightings, Helsinki has the highest daily chance: under 5%. Next come Moscow (Russia, under 5%).
Same genus: Helophilus
The closest relatives of the Migrant Marsh Fly that you can see in Helsinki (genus Helophilus, Marsh Flies) are Sun Fly (about 20%) and Trivittate Marsh Fly (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Migrant Marsh Fly is recorded against all the insects logged in Helsinki (5 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.
