Noctua janthe
In 3 days ~40% in a week ~70%
Noctua janthe, the lesser broad-bordered yellow underwing, is a moth of the family Noctuidae. Some authors consider Noctua janthe and Noctua janthina to be the same species. It is found in Europe and North Africa. The wingspan is 30–40 mm (1.2–1.6 in). The length of the forewings is 16–20 mm (0.63–0.79 in). The ground colour of the forewings varies from bright ochre to gray to brown, often with a reddish or light purple tint. Orbicular and reniform are not clearly marked. The hindwing is orange-yellow with a broad distal black band. This species can only be separated from Noctua janthina by examination of the genitalia.
See Townsend et al. The moth flies in one generation from late June to September.[1] The larvae feed on various deciduous trees, shrubs and herbaceous plants. ^The flight season refers to Belgium and The Netherlands. This may vary in other parts of the range.
"Noctua janthe (Borkhausen, 1792) Janthe-Bandeule". Lepiforum (in German). Includes comparison with janthina photos and other diagnostics Markku Savela's. "Noctua janthe". Lepidoptera and Some Other Life Forms. "Open-breedbandhuismoeder | Noctua janthe". Vlindernet... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Snowdonia National Park | 🇬🇧 United Kingdom | |
| 2 | Cairngorms National Park | 🇬🇧 United Kingdom |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Liverpool | 🇬🇧 United Kingdom | |
| 2 | London | 🇬🇧 United Kingdom | |
| 3 | Birmingham | 🇬🇧 United Kingdom | |
| 4 | Manchester | 🇬🇧 United Kingdom |
Possible
About 20% of wildlife watchers report a Lesser Broad-Bordered Yellow Underwing sighting in Snowdonia National Park on a given day, based on 24 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 84th most-seen of the 387 insects we can rate there. Over three days the chance rises to about 40%, and over a week to about 70%, if each day is a fresh chance.
August
In that month about 40% of wildlife watchers report a Lesser Broad-Bordered Yellow Underwing in Snowdonia National Park on a given day, against under 5% in October to June, the lowest months.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Lesser Broad-Bordered Yellow Underwing sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 2 parks where we can rate Lesser Broad-Bordered Yellow Underwing sightings, Snowdonia National Park has the highest daily chance: about 20%. Next come Cairngorms National Park (United Kingdom, about 10%).
Same genus: Noctua
The closest relatives of the Lesser Broad-Bordered Yellow Underwing that you can see in Snowdonia National Park (genus Noctua, Yellow Underwings) are Large Yellow Underwing (about 30%) and Lesser Yellow Underwing (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Lesser Broad-Bordered Yellow Underwing is recorded against all the insects logged in Snowdonia National Park (24 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.
