Eulithis pyraliata
In 3 days ~10% in a week ~30%
The barred straw (Eulithis pyraliata) is a moth of the family Geometridae. The species was first described by Michael Denis and Ignaz Schiffermüller in 1775. It is sometimes placed in the genus Gandaritis. It is found throughout the Palearctic region, including Britain and Ireland, and also the Near East.
The wingspan is 33–38 mm. The forewings are bright yellow with two narrow brown fascia. The hindwings are cream coloured but are rarely seen due to the characteristic resting position (see spinach moth).The larva is naked, green with two narrow white dorsal stripes.
The species flies at night from June to August [1] and is attracted to light. The larva feeds on bedstraw. The species overwinters as an egg. ^ The flight season refers to the British Isles. This may vary in other parts of the range. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Mercantour National Park | 🇫🇷 France | |
| 2 | Cairngorms National Park | 🇬🇧 United Kingdom | |
| 3 | Ecrins National Park | 🇫🇷 France | |
| 4 | Wadden Sea National Park | 🇩🇪 Germany | |
| 5 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 6 | Pyrénées National Park | 🇫🇷 France |
With luck
About 10% of wildlife watchers report a Barred Straw sighting in Wadden Sea National Park on a given day, based on 23 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 340th most-seen of the 818 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 Barred Straw in Wadden Sea National Park on a given day, against under 5% in August to May, the lowest months.
Between 10 pm and 1 am
Across all the parks we cover, that three-hour window holds the most Barred Straw sightings with a recorded time, and about half of them come between 6 pm and 6 am: it is seen both by day and at night.
Among the best
Of the 6 parks where we can rate Barred Straw sightings, Wadden Sea National Park ranks 4th at about 10%, level with the leaders once rounded. The best odds are in Mercantour National Park (France, about 10%), Cairngorms National Park (United Kingdom, about 10%) and Ecrins National Park (France, about 10%).
GBIF citizen-science records
It is estimated from how often the Barred Straw is recorded against all the insects logged in Wadden Sea National Park (23 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.
