Agrotis bigramma
In 3 days ~20% in a week ~30%
Agrotis bigramma, the great dart, is a moth of the family Noctuidae. The species was first described by Eugenius Johann Christoph Esper in 1790. It occurs in Europe, North Africa, and Asia east to Afganistan and SW Siberia; it is widespread in much of Europe but scarce or absent in the northern parts (it is a rare visitor Great Britain).
The wingspan is 40–48 mm. Adults are on wing from July to December (primarily August in the UK, September to November in the south). There is one generation per year. The larvae are polyphagous and are found on the roots and lower parts of various low-growing herbaceous plants including Poaceae and Scrophulariaceae. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sierra de Guadarrama National Park | 🇪🇸 Spain | |
| 2 | Pyrénées National Park | 🇫🇷 France |
With luck
About 10% of wildlife watchers report a Great Dart sighting in Sierra de Guadarrama National Park on a given day, based on 20 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 207th 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 30%, if each day is a fresh chance.
September
In that month about 20% of wildlife watchers report a Great Dart in Sierra de Guadarrama National Park on a given day, against under 5% in November to July, the lowest months.
Between 10 pm and 1 am
Across all the parks we cover, that three-hour window holds the most Great Dart sightings with a recorded time, and about 8 in 10 of them come between 6 pm and 6 am: it is mostly seen at night.
Yes
Of the 2 parks where we can rate Great Dart sightings, Sierra de Guadarrama National Park has the highest daily chance: about 10%. Next come Pyrénées National Park (France, under 5%).
Same genus: Agrotis
The closest relatives of the Great Dart that you can see in Sierra de Guadarrama National Park (genus Agrotis) are Turnip Moth (about 10%), Crescent Dart (about 10%) and Shuttle-Shaped Dart (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Great Dart is recorded against all the insects logged in Sierra de Guadarrama National Park (20 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.
