Ennomos autumnaria
In 3 days ~10% in a week ~20%
Ennomos autumnaria, the large thorn, is a moth of the family Geometridae. The species can be found in Western and Central Europe East to Russia and Siberia The wingspan is 40–50 mm. The length of the forewings is 21–28 mm. The ground colour is brown, red-brown or yellow-brown to yellowish beige. The forewing edge is scalloped and the forewing is marked with yellow and dark brown lines. The thorax is yellow to light brown. The antennae of the male are pectinate. The caterpillar is light yellowish-brown to reddish. It is up to 50 mm long. On segment five there few humps and on segment nine two long protrusions. It resembles a dead twig.
Similar species: other Ennomos. Biotopes: Forest edges, parks, gardens with trees. The moths fly in one generation from September to October.[1] They are attracted to light. The caterpillars feed on a number of deciduous trees.(Quercus sp., Alnus sp., Prunus sp., Salix sp., Tilia sp., Malus sp., Populus sp., Acer sp., Betula sp., Ulmus sp.). Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Wadden Sea National Park | 🇩🇪 Germany |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Novosibirsk | 🇷🇺 Russia | |
| 2 | Kyiv | 🇺🇦 Ukraine | |
| 3 | Nizhny Novgorod | 🇷🇺 Russia | |
| 4 | Moscow | 🇷🇺 Russia | |
| 5 | Prague | 🇨🇿 Czechia | |
| 6 | Saint Petersburg | 🇷🇺 Russia | |
| 7 | Vienna | 🇦🇹 Austria |
Rare
Under 5% of wildlife watchers report a Large Thorn sighting in Prague on a given day, based on 5 verified sightings from GBIF citizen-science data. It is the 647th most-seen of the 724 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.
August
In that month about 10% of wildlife watchers report a Large Thorn in Prague on a given day, against under 5% in September to July, the lowest months. That is one of Prague's wettest months, with about 80 mm of rain against 30 mm in February.
Between 5 and 8 am
Across all the parks we cover, that three-hour window holds the most Large Thorn sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
5th of 7
Of the 7 cities where we can rate Large Thorn sightings, Prague ranks 5th at under 5%. The best odds are in Novosibirsk (Russia, about 10%), Kyiv (Ukraine, under 5%) and Nizhny Novgorod (Russia, under 5%).
GBIF citizen-science records
It is estimated from how often the Large Thorn is recorded against all the insects logged in Prague (5 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.
