Selenia dentaria
In 3 days ~20% in a week ~40%
Selenia dentaria, the early thorn, is a moth of the family Geometridae. It is found in Northern Europe, and across the Palearctic to the Caucasus, Transcaucasia, North Siberia, Russian Far East, Amur and Mongolia. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Snowdonia National Park | 🇬🇧 United Kingdom | |
| 2 | Wadden Sea National Park | 🇩🇪 Germany | |
| 3 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 4 | Pyrénées National Park | 🇫🇷 France |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Porto | 🇵🇹 Portugal | |
| 2 | Manchester | 🇬🇧 United Kingdom | |
| 3 | Liverpool | 🇬🇧 United Kingdom | |
| 4 | Birmingham | 🇬🇧 United Kingdom | |
| 5 | London | 🇬🇧 United Kingdom | |
| 6 | Leeds | 🇬🇧 United Kingdom | |
| 7 | Copenhagen | 🇩🇰 Denmark |
With luck
About 10% of wildlife watchers report an Early Thorn sighting in Porto on a given day, based on 45 verified sightings from GBIF citizen-science data. It is the 127th most-seen of the 498 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
February and August
In those months about 20% of wildlife watchers report an Early Thorn in Porto on a given day, against under 5% in January, March–May and October–November, the lowest months.
Between 11 pm and 2 am
Across all the parks we cover, that three-hour window holds the most Early Thorn sightings with a recorded time, and about half of them come between 6 pm and 6 am: it is seen both by day and at night.
Yes
Of the 7 cities where we can rate Early Thorn sightings, Porto has the highest daily chance: about 10%. Next come Manchester (United Kingdom, about 10%) and Liverpool (United Kingdom, about 10%).
Same family: Geometridae
The closest relatives of the Early Thorn that you can see in Porto (family Geometridae, Geometer Moths) are Double-Striped Pug (about 20%), Vestal (about 20%) and Pale Oak Beauty (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Early Thorn is recorded against all the insects logged in Porto (45 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.
