Eudonia delunella
In 3 days ~10% in a week ~30%
Eudonia delunella is a species of moth of the family Crambidae. It was described by Henry Tibbats Stainton in 1849 and is found in Europe. The wingspan is 17–18 mm (0.67–0.71 in). The forewings are white, irregularly blackish-mixed with a black triangular mark from base of costa; lines white, dark-edged, first irregular, second strongly sinuate; an irregular blackish costal blotch beyond first including orbicular and claviform, and a quadrate blotch before second concealing discal spot; terminal area blackish, subterminal line white, touching second in middle. Hindwings are light grey, darker terminally; a darker discal mark. The larva is greenish-yellow; spots, head, and plate of 2 dark bronzy -brown.
The moth flies from June to September depending on the location. The larvae feed on various mosses and lichen. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cévennes National Park | 🇫🇷 France | |
| 2 | Sierra de Guadarrama National Park | 🇪🇸 Spain | |
| 3 | Pyrénées National Park | 🇫🇷 France | |
| 4 | Bavarian Forest National Park | 🇩🇪 Germany |
Rare
Under 5% of wildlife watchers report a Pied Grey sighting in Brussels on a given day, based on 6 verified sightings from GBIF citizen-science data. It is the 260th most-seen of the 337 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.
May to July
In those months about 10% of wildlife watchers report a Pied Grey in Brussels on a given day, against under 5% in August to April, the lowest months.
Between 10 pm and 1 am
Across all the parks we cover, that three-hour window holds the most Pied Grey sightings with a recorded time, and about 7 in 10 of them come between 6 pm and 6 am: it is seen both by day and at night.
Among the best
Of the 4 cities where we can rate Pied Grey sightings, Brussels ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Porto (Portugal, under 5%).
GBIF citizen-science records
It is estimated from how often the Pied Grey is recorded against all the insects logged in Brussels (6 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.
