Archiearis parthenias
In 3 days ~10% in a week ~30%
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 |
Rare
Under 5% of wildlife watchers report an Orange Underwing sighting in Helsinki on a given day, based on 15 verified sightings from GBIF citizen-science data. It is the 360th 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 30%, if each day is a fresh chance.
March and April
In those months about 10% of wildlife watchers report an Orange Underwing in Helsinki on a given day, against under 5% in May 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.
2nd of 4
Of the 4 cities where we can rate Orange Underwing sightings, Helsinki ranks 2nd at under 5%. The best odds are in Novosibirsk (Russia, about 10%).
Same family: Geometridae
The closest relatives of the Orange Underwing 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 Orange Underwing is recorded against all the insects logged in Helsinki (15 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.
