Pheosia tremula
In 3 days ~10% in a week ~20%
Pheosia tremula, the swallow prominent, is a moth from the family Notodontidae. The species was first described by Carl Alexander Clerck in 1759. The moth can be found in the Palearctic realm, up to the Arctic Circle (northern and central Europe, Russia, Russian Far East, Ussuri, Caucasus). It has a forewing length of 22–28 mm. The moth survives winter as a pupa underground.
Normally whitish, with a brown shaded black stripe along the inner margin of the forewings, and a brownish cloud, with black streaks in it. Towards the tips of these wings; the outer extremities of the veins are white, there is a white wedge-shaped streak between veins 1 and 2, and from the apex of this an indented white line runs to the base of the wing. Sometimes the whole discal area is suffused with brownish. The imago can be easily mistaken with Pheosia gnoma.
Seitz- Head and thorax grey or predominantly brown, abdomen greyish brown. Fore«'ing whitish, brownish at the margins, beyond the middle of the costal margin 2 black longitudinal smears, which often merge together in the shape of a band, a black longitudinal line in front of the hind margin from the base to the distal margin; below... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 2 | Wadden Sea National Park | 🇩🇪 Germany | |
| 3 | Cairngorms National Park | 🇬🇧 United Kingdom | |
| 4 | Cévennes National Park | 🇫🇷 France | |
| 5 | Pyrénées National Park | 🇫🇷 France |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Liverpool | 🇬🇧 United Kingdom | |
| 2 | Porto | 🇵🇹 Portugal | |
| 3 | Amsterdam | 🇳🇱 Netherlands | |
| 4 | Manchester | 🇬🇧 United Kingdom | |
| 5 | Birmingham | 🇬🇧 United Kingdom | |
| 6 | Helsinki | 🇫🇮 Finland | |
| 7 | Berlin | 🇩🇪 Germany | |
| 8 | Copenhagen | 🇩🇰 Denmark | |
| 9 | London | 🇬🇧 United Kingdom | |
| 10 | Moscow | 🇷🇺 Russia |
Rare
Under 5% of wildlife watchers report a Swallow Prominent sighting in Helsinki on a given day, based on 7 verified sightings from GBIF citizen-science data. It is the 602nd most-seen of the 838 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.
July and August
In those months about 10% of wildlife watchers report a Swallow Prominent in Helsinki on a given day, against under 5% in September to June, the lowest months.
Between midnight and 3 am
Across all the parks we cover, that three-hour window holds the most Swallow Prominent sightings with a recorded time, and about half of them come between 6 am and 6 pm: it is seen both by day and at night.
6th of 10
Of the 10 cities where we can rate Swallow Prominent sightings, Helsinki ranks 6th at under 5%. The best odds are in Liverpool (United Kingdom, about 10%), Porto (Portugal, about 10%) and Amsterdam (Netherlands, under 5%).
GBIF citizen-science records
It is estimated from how often the Swallow Prominent is recorded against all the insects logged in Helsinki (7 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.
