Ennomos quercaria
In 3 days ~10% in a week ~30%
Ennomos quercaria, the clouded August thorn, is a species of moth in the family Geometridae. The species was first described by Jacob Hübner in 1813. It is mostly found in southern Europe. There are two dubious records from Britain, one in the 19th century, then again in south-east England in 1992.
The wingspan is 28–35 mm. Adults are on wing from June to September. The larvae feed on various species of oak. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sierra de Guadarrama National Park | 🇪🇸 Spain |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Porto | 🇵🇹 Portugal |
Rare
Under 5% of wildlife watchers report a Clouded August Thorn sighting in Sierra de Guadarrama National Park on a given day, based on 10 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 325th most-seen of the 597 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.
June–July and September–October
In those months about 10% of wildlife watchers report a Clouded August Thorn in Sierra de Guadarrama National Park on a given day, against under 5% in August and November–May, the lowest months.
Between 10 pm and 1 am
Across all the parks we cover, that three-hour window holds the most Clouded August Thorn sightings with a recorded time, and about 9 in 10 of them come between 6 pm and 6 am: it is mostly seen at night.
Only Sierra de Guadarrama National Park, in our data
Sierra de Guadarrama National Park is the only park on Wallace's Line with enough records to rate Clouded August Thorn sightings: under 5% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Clouded August Thorn is recorded against all the insects logged in Sierra de Guadarrama National Park (10 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.
