Archiearis parthenias
In 3 days ~30% in a week ~50%
Archiearis parthenias, the orange underwing, is a moth of the family Geometridae. The species was first described by Carl Linnaeus in 1761 and can be found in Europe, Russia and Japan. The wingspan is about 30–40 mm. The moths fly from February to May depending on the location.
The larvae feed first on the catkins and then on the leaves of birch (Betula species). Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Białowieża National Park | 🇵🇱 Poland |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Novosibirsk | 🇷🇺 Russia | |
| 2 | Helsinki | 🇫🇮 Finland | |
| 3 | Moscow | 🇷🇺 Russia | |
| 4 | Yekaterinburg | 🇷🇺 Russia |
With luck
About 10% of wildlife watchers report an Orange Underwing sighting in Białowieża National Park on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 131st most-seen of the 158 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.
March
In that month about 50% of wildlife watchers report an Orange Underwing in Białowieża National Park on a given day, against under 5% in April to February, the lowest months.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Orange Underwing sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Only Białowieża National Park, in our data
Białowieża National Park is the only park on Wallace's Line with enough records to rate Orange Underwing sightings: about 10% of wildlife watchers there report one on a given day.
Same family: Geometridae
The closest relatives of the Orange Underwing that you can see in Białowieża National Park (family Geometridae, Geometer Moths) are Latticed Heath (about 20%), Common Heath (about 20%) and Speckled Yellow (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Orange Underwing is recorded against all the insects logged in Białowieża National Park (5 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.
