Ennomos fuscantaria
In 3 days ~20% in a week ~30%
Ennomos fuscantaria, the dusky thorn, is a moth of the family Geometridae. The species can be found in the western part of the Palearctic realm in western Europe and from central Scandinavia its range extends to the northern Mediterranean and east to Russia.
The wingspan is 35–40 mm. The ground colour is ochre yellow. There are violet-grey flecks on the forewing and an oblong discal spot. The fasciae (bands) are grey brown. On the hindwing the grey brown transverse line hides a small discal spot.
Other Ennomos species are similar. The moth is on wing from July to October depending on the location. The caterpillars feed on ash (Fraxinus excelsior), but also privet (Ligustrum species) and other shrubs. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Snowdonia National Park | 🇬🇧 United Kingdom | |
| 2 | Sierra de Guadarrama National Park | 🇪🇸 Spain | |
| 3 | Bavarian Forest National Park | 🇩🇪 Germany |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Liverpool | 🇬🇧 United Kingdom | |
| 2 | London | 🇬🇧 United Kingdom | |
| 3 | Birmingham | 🇬🇧 United Kingdom | |
| 4 | Manchester | 🇬🇧 United Kingdom | |
| 5 | Leeds | 🇬🇧 United Kingdom | |
| 6 | Essen | 🇩🇪 Germany | |
| 7 | Copenhagen | 🇩🇰 Denmark |
With luck
About 10% of wildlife watchers report a Dusky Thorn sighting in Bavarian Forest National Park on a given day, based on 9 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 585th most-seen of the 1115 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 30%, if each day is a fresh chance.
September
In that month about 20% of wildlife watchers report a Dusky Thorn in Bavarian Forest National Park on a given day, against under 5% in October to July, the lowest months.
Between 10 pm and 1 am
Across all the parks we cover, that three-hour window holds the most Dusky Thorn sightings with a recorded time, and about 6 in 10 of them come between 6 pm and 6 am: it is seen both by day and at night.
Among the best
Of the 3 parks where we can rate Dusky Thorn sightings, Bavarian Forest National Park ranks 3rd at about 10%, level with the leaders once rounded. The best odds are in Snowdonia National Park (United Kingdom, about 10%) and Sierra de Guadarrama National Park (Spain, about 10%).
Same genus: Ennomos
The closest relatives of the Dusky Thorn that you can see in Bavarian Forest National Park (genus Ennomos) are September Thorn (about 10%) and August Thorn (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Dusky Thorn is recorded against all the insects logged in Bavarian Forest National Park (9 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.
