Selenia dentaria
In 3 days ~10% in a week ~20%
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 |
Rare
Under 5% of wildlife watchers report an Early Thorn sighting in Copenhagen on a given day, based on 6 verified sightings from GBIF citizen-science data. It is the 376th most-seen of the 476 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 an Early Thorn in Copenhagen on a given day, against under 5% in August to June, 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.
7th of 7
Of the 7 cities where we can rate Early Thorn sightings, Copenhagen ranks 7th at under 5%. The best odds are in Porto (Portugal, about 10%), 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 Copenhagen (family Geometridae, Geometer Moths) are Small Dusty Wave (about 10%), Double-Striped Pug (about 10%) and Riband Wave (about 10%), 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 Copenhagen (6 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.
