Pheosia gnoma
In 3 days ~50% in a week ~80%
Pheosia gnoma, the lesser swallow prominent, is a moth from the family Notodontidae. The species was first described by Johan Christian Fabricius in 1777. The moth can be found across the Palearctic realm (northern and central Europe, Russia, eastern Siberia, Russian Far East, Amur). It has a forewing length of 20–26 mm.
The imago can be easily confused with Pheosia tremula but P. gnoma is usually smaller, and the ground colour has usually less brown in it. The chief character by which it may be distinguished is the broader and clearer white wedge-shaped mark between veins 1 and 2 on the forewings of P. gnoma.
Seitz - Very similar to tremula, usually somewhat smaller, the white wedge-spot below vein 1 of the forewing shorter and entirely white, without dark scaling in it. Anal angle of hindwing brownish without white marginal line. In the Higher Alps occurs a dark form of this species, ab. leonis Stichel which is scarcely distinguishable from the Arctic form frigida Zett. (45f) from Lapland, in which the wedge-spot of the forewing is grey instead of white. — Throughout Central Europe, northward to Lapland, southward to Southern France, Northern Italy, Croatia, and... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Snowdonia National Park | 🇬🇧 United Kingdom | |
| 2 | Cairngorms National Park | 🇬🇧 United Kingdom | |
| 3 | Wadden Sea National Park | 🇩🇪 Germany | |
| 4 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 5 | Pyrénées National Park | 🇫🇷 France |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Liverpool | 🇬🇧 United Kingdom | |
| 2 | Helsinki | 🇫🇮 Finland | |
| 3 | Manchester | 🇬🇧 United Kingdom | |
| 4 | London | 🇬🇧 United Kingdom | |
| 5 | Moscow | 🇷🇺 Russia |
Possible
About 20% of wildlife watchers report a Lesser Swallow Prominent sighting in Snowdonia National Park on a given day, based on 32 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 54th most-seen of the 387 insects we can rate there. Over three days the chance rises to about 50%, and over a week to about 80%, if each day is a fresh chance.
April and May
In those months about 30% of wildlife watchers report a Lesser Swallow Prominent in Snowdonia National Park on a given day, against under 5% in June and October–March, the lowest months.
Between 11 pm and 2 am
Across all the parks we cover, that three-hour window holds the most Lesser 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.
Yes
Of the 5 parks where we can rate Lesser Swallow Prominent sightings, Snowdonia National Park has the highest daily chance: about 20%. Next come Cairngorms National Park (United Kingdom, about 10%) and Wadden Sea National Park (Germany, about 10%).
Same family: Notodontidae
The closest relatives of the Lesser Swallow Prominent that you can see in Snowdonia National Park (family Notodontidae, Prominent Moths) are Buff-Tip (about 30%), Great Prominent (about 20%) and Pebble Prominent (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Lesser Swallow Prominent is recorded against all the insects logged in Snowdonia National Park (32 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.
