Perizoma didymata
In 3 days ~10% in a week ~20%
Mesotype didymata, the twin-spot carpet, is a moth of the family Geometridae. The species was first described by Carl Linnaeus in his 1758 10th edition of Systema Naturae. Its genus is sometimes included in Perizoma. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cairngorms National Park | 🇬🇧 United Kingdom | |
| 2 | Bavarian Forest National Park | 🇩🇪 Germany |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Helsinki | 🇫🇮 Finland | |
| 2 | Saint Petersburg | 🇷🇺 Russia |
Rare
Under 5% of wildlife watchers report a Twin-Spot Carpet 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 Twin-Spot Carpet in Helsinki on a given day, against under 5% in August to June, the lowest months.
Between 5 and 8 am
Across all the parks we cover, that three-hour window holds the most Twin-Spot Carpet sightings with a recorded time, and about 7 in 10 of them come between 6 am and 6 pm: it is most active around dawn and dusk.
Yes
Of the 2 cities where we can rate Twin-Spot Carpet sightings, Helsinki has the highest daily chance: under 5%. Next come Saint Petersburg (Russia, under 5%).
GBIF citizen-science records
It is estimated from how often the Twin-Spot Carpet 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.
