Hemistola chrysoprasaria
In 3 days ~20% in a week ~40%
Hemistola chrysoprasaria, the small emerald, is a moth of the family Geometridae. The species can be found in all Europe including the Iberian Peninsula and Russia East to the Ural Mountains, North Africa, Asia Minor, Transcaucasia and the mountains of Eastern Asia (Russian Far East, Siberia), (Amur, Ussuri) and China Tian Shan (as form lissas) Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cévennes National Park | 🇫🇷 France | |
| 2 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 3 | Pyrénées National Park | 🇫🇷 France |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | London | 🇬🇧 United Kingdom | |
| 2 | Vienna | 🇦🇹 Austria | |
| 3 | Copenhagen | 🇩🇰 Denmark |
With luck
About 10% of wildlife watchers report a Small Emerald sighting in London on a given day, based on 71 verified sightings from GBIF citizen-science data. It is the 384th most-seen of the 1504 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
June to August
In those months about 10% of wildlife watchers report a Small Emerald in London on a given day, against under 5% in September to May, the lowest months.
Between 10 pm and 1 am
Across all the parks we cover, that three-hour window holds the most Small Emerald sightings with a recorded time, and about 7 in 10 of them come between 6 pm and 6 am: it is seen both by day and at night.
Yes
Of the 3 cities where we can rate Small Emerald sightings, London has the highest daily chance: about 10%. Next come Vienna (Austria, under 5%) and Copenhagen (Denmark, under 5%).
Same family: Geometridae
The closest relatives of the Small Emerald that you can see in London (family Geometridae, Geometer Moths) are Riband Wave (about 20%), Least Carpet (about 20%) and Double-Striped Pug (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Small Emerald is recorded against all the insects logged in London (71 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.
