Hemithea aestivaria
In 3 days ~20% in a week ~40%
The common emerald (Hemithea aestivaria) is a moth of the family Geometridae. The species is found throughout the Nearctic and Palearctic regions and the Near East. It is mostly commonly found in the southern half of Ireland and Britain. It was accidentally introduced into southern British Columbia in 1973.
All wings are generally soft grey-green with grey and white chequered fringes and narrow white fascia, two on the forewing, one on the hindwing. The green colouration tends not to fade over time as much as in other emeralds. The hindwings have a sharply angled termen giving the moth a very distinctive shape. The wingspan is 30–35 mm.
It flies at dusk and night in June and July and will come to light. The larva is green with reddish-brown markings and black v-shaped marks along the back. The young larva will feed on most plants but later it feeds on trees and shrubs. The species overwinters as a larva.
^ The flight season refers to the British Isles. This may vary in other parts of the range. Aralia Artemisia Betula – birch Camellia Carpinus – hornbeam Castanea – chestnut Citrus Corylus – hazel Crataegus - hawthorn Diervilla... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 2 | Snowdonia National Park | 🇬🇧 United Kingdom | |
| 3 | Wadden Sea National Park | 🇩🇪 Germany | |
| 4 | Pyrénées National Park | 🇫🇷 France | |
| 5 | Cévennes National Park | 🇫🇷 France |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Liverpool | 🇬🇧 United Kingdom | |
| 2 | Kharkiv | 🇺🇦 Ukraine | |
| 3 | Manchester | 🇬🇧 United Kingdom | |
| 4 | Copenhagen | 🇩🇰 Denmark | |
| 5 | Birmingham | 🇬🇧 United Kingdom | |
| 6 | London | 🇬🇧 United Kingdom | |
| 7 | Amsterdam | 🇳🇱 Netherlands | |
| 8 | Rotterdam [The Hague] | 🇳🇱 Netherlands | |
| 9 | Porto | 🇵🇹 Portugal | |
| 10 | Seattle | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Common Emerald sighting in Bavarian Forest National Park on a given day, based on 16 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 347th 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 40%, if each day is a fresh chance.
June
In that month about 20% of wildlife watchers report a Common Emerald in Bavarian Forest National Park on a given day, against under 5% in July–August and October–May, the lowest months.
Between 11 pm and 2 am
Across all the parks we cover, that three-hour window holds the most Common Emerald sightings with a recorded time, and about 7 in 10 of them come between 6 pm and 6 am: it is mostly seen at night.
Yes
Of the 5 parks where we can rate Common Emerald sightings, Bavarian Forest National Park has the highest daily chance: about 10%. Next come Snowdonia National Park (United Kingdom, about 10%) and Wadden Sea National Park (Germany, about 10%).
Same family: Geometridae
The closest relatives of the Common Emerald that you can see in Bavarian Forest National Park (family Geometridae, Geometer Moths) are Common Heath (about 20%), Latticed Heath (about 20%) and Yellow Shell Moth (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Common Emerald is recorded against all the insects logged in Bavarian Forest National Park (16 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.
