Hemithea aestivaria
In 3 days ~10% in a week ~30%
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 |
Rare
Under 5% of wildlife watchers report a Common Emerald sighting in Vancouver on a given day, based on 43 verified sightings from GBIF citizen-science data. It is the 139th most-seen of the 482 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 and July
In those months about 10% of wildlife watchers report a Common Emerald in Vancouver on a given day, against under 5% in August to May, the lowest months. Those are among Vancouver's driest months, with about 35 mm of rain a month against 210 mm in November.
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.
11th of 15
Of the 15 cities where we can rate Common Emerald sightings, Vancouver ranks 11th at under 5%. The best odds are in Liverpool (United Kingdom, about 10%), Kharkiv (Ukraine, about 10%) and Manchester (United Kingdom, about 10%).
Same family: Geometridae
The closest relatives of the Common Emerald that you can see in Vancouver (family Geometridae, Geometer Moths) are Hemlock Looper Moth (about 10%) and Phantom Hemlock Looper (about 10%), 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 Vancouver (43 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.
