Scopula immorata
In 3 days ~10% in a week ~20%
Scopula immorata, the Lewes wave, is a moth of the family Geometridae. It is found throughout Europe and the Near East. The wingspan is 20–27 millimetres (0.79–1.06 in). The moth flies in two generations from the end of June to mid August in western Europe.
The larva feeds on various low-growing plants like thyme and oregano. Mating occurs from the males seeking out females in simple courtship behavior, taking place at ~6-10am for an hour to an hour and a half. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Biebrza National Park | 🇵🇱 Poland | |
| 2 | Vanoise National Park | 🇫🇷 France | |
| 3 | Mercantour National Park | 🇫🇷 France | |
| 4 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 5 | Pyrénées National Park | 🇫🇷 France |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Nizhny Novgorod | 🇷🇺 Russia | |
| 2 | Berlin | 🇩🇪 Germany | |
| 3 | Prague | 🇨🇿 Czechia | |
| 4 | Helsinki | 🇫🇮 Finland | |
| 5 | Vienna | 🇦🇹 Austria | |
| 6 | Moscow | 🇷🇺 Russia | |
| 7 | Saint Petersburg | 🇷🇺 Russia |
Rare
Under 5% of wildlife watchers report a Lewes Wave sighting in Vienna on a given day, based on 12 verified sightings from GBIF citizen-science data. It is the 795th most-seen of the 1406 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.
June
In that month about 10% of wildlife watchers report a Lewes Wave in Vienna on a given day, against under 5% in July to May, the lowest months. That is one of Vienna's wettest months, with about 90 mm of rain against 40 mm in February.
Between 10 pm and 1 am
Across all the parks we cover, that three-hour window holds the most Lewes Wave sightings with a recorded time, and about 6 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
5th of 7
Of the 7 cities where we can rate Lewes Wave sightings, Vienna ranks 5th at under 5%. The best odds are in Nizhny Novgorod (Russia, about 10%), Berlin (Germany, under 5%) and Prague (Czechia, under 5%).
GBIF citizen-science records
It is estimated from how often the Lewes Wave is recorded against all the insects logged in Vienna (12 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.
