Polyphaenis sericata
In 3 days ~10% in a week ~20%
Polyphaenis sericata, the Guernsey underwing, is a moth of the family Noctuidae. The species was first described by Eugenius Johann Christoph Esper in 1787. It is found in Europe and Asia. The wingspan is 38–44 millimetres (1.5–1.7 in).
The larvae feed on various herbaceous plants, including privet, honeysuckle and dogwood. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cévennes National Park | 🇫🇷 France | |
| 2 | Sierra de Guadarrama National Park | 🇪🇸 Spain | |
| 3 | Pyrénées National Park | 🇫🇷 France |
Rare
Under 5% of wildlife watchers report a Guernsey Underwing sighting in Pyrénées National Park on a given day, based on 6 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 1144th most-seen of the 1277 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.
June
In that month about 10% of wildlife watchers report a Guernsey Underwing in Pyrénées National Park on a given day, against under 5% in July to May, the lowest months.
Between 11 pm and 2 am
Across all the parks we cover, that three-hour window holds the most Guernsey Underwing sightings with a recorded time, and about 9 in 10 of them come between 6 pm and 6 am: it is mostly seen at night.
3rd of 3
Of the 3 parks where we can rate Guernsey Underwing sightings, Pyrénées National Park ranks 3rd at under 5%. The best odds are in Cévennes National Park (France, about 10%) and Sierra de Guadarrama National Park (Spain, about 10%).
Same family: Noctuidae
The closest relatives of the Guernsey Underwing that you can see in Pyrénées National Park (family Noctuidae, Cutworm Moths and Allies) are Silver Υ (about 10%), Cotton Bollworm Moth (about 10%) and Marbled White-Spot (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Guernsey Underwing is recorded against all the insects logged in Pyrénées National Park (6 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.
