Lasiocampa trifolii
In 3 days ~20% in a week ~40%
Lasiocampa trifolii, the grass eggar, is a moth of the family Lasiocampidae first described by Michael Denis and Ignaz Schiffermüller in 1775 and found in Europe. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Kiskunság National Park | 🇭🇺 Hungary | |
| 2 | Picos de Europa National Park | 🇪🇸 Spain | |
| 3 | Doñana National Park | 🇪🇸 Spain | |
| 4 | Monfragüe National Park | 🇪🇸 Spain | |
| 5 | Cévennes National Park | 🇫🇷 France | |
| 6 | Camargue | 🇫🇷 France | |
| 7 | Triglav National Park | 🇸🇮 Slovenia | |
| 8 | Sierra Nevada National Park | 🇪🇸 Spain | |
| 9 | Pyrénées National Park | 🇫🇷 France | |
| 10 | Wadden Sea National Park | 🇩🇪 Germany | |
| 11 | Fertő-Hanság National Park | 🇭🇺 Hungary | |
| 12 | Sierra de Guadarrama National Park | 🇪🇸 Spain |
With luck
About 10% of wildlife watchers report a Grass Eggar sighting in Sierra de Guadarrama National Park on a given day, based on 29 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 117th most-seen of the 597 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
September
In that month about 20% of wildlife watchers report a Grass Eggar in Sierra de Guadarrama National Park on a given day, against under 5% in June–July and November–February, the lowest months.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Grass Eggar sightings with a recorded time, and about 7 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
12th of 12
Of the 12 parks where we can rate Grass Eggar sightings, Sierra de Guadarrama National Park ranks 12th at about 10%. The best odds are in Kiskunság National Park (Hungary, about 30%), Picos de Europa National Park (Spain, about 20%) and Doñana National Park (Spain, about 20%).
GBIF citizen-science records
It is estimated from how often the Grass Eggar is recorded against all the insects logged in Sierra de Guadarrama National Park (29 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.
