Epirrita autumnata
In 3 days ~20% in a week ~30%
The autumnal moth (Epirrita autumnata) is a moth of the family Geometridae. The species was first described by Moritz Balthasar Borkhausen in 1794. It is found throughout the Palearctic region and the Near East and has a much wider distribution than its two close relatives (see below). In Sápmi (Lapland), in some years, the numerous autumnal moth larvae defoliate square miles of birch forests on mountains. Wikipedia →
| # | Park | Country | Daily sighting probability |
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More parks will be added in future updates.
With luck
About 10% of wildlife watchers report an Autumnal Moth sighting in Helsinki on a given day, based on 23 verified sightings from GBIF citizen-science data. It is the 251st most-seen of the 838 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 30%, if each day is a fresh chance.
September and October
In those months about 20% of wildlife watchers report an Autumnal Moth in Helsinki on a given day, against under 5% in November to August, the lowest months.
Yes
Of the 4 cities where we can rate Autumnal Moth sightings, Helsinki has the highest daily chance: about 10%. Next come Moscow (Russia, under 5%) and Seattle (United States, under 5%).
Same family: Geometridae
The closest relatives of the Autumnal Moth that you can see in Helsinki (family Geometridae, Geometer Moths) are Common Carpet Moth (about 10%), Mottled Umber (about 10%) and Latticed Heath (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Autumnal Moth is recorded against all the insects logged in Helsinki (23 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.
