Arethusana arethusa
In 3 days ~30% in a week ~50%
Arethusana is a butterfly genus from the subfamily Satyrinae of the brush-footed butterfly family (Nymphalidae). It is composed of only one species, Arethusana arethusa, the false grayling. Arethusana arethusa dentata (Staudinger, 1871) (Catalonia – Spain) The subspecies Arethusana arethusa boabdil and Arethusana arethusa dentata are considered as full species by some authors. Arethusana arethusa has a wingspan of 42–47 millimetres (1.7–1.9 in) in males, of 50–54 millimetres (2.0–2.1 in) in females. The length of the forewings can reach 21–25 mm. The upper surface of the wings is dark brown, with a characteristic series of ocher-orange oval markings forming a V and a blackish brown large spot close to the top of the forewings. Also the hindwings have a small blackish spot near the... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cévennes National Park | 🇫🇷 France | |
| 2 | Mercantour National Park | 🇫🇷 France | |
| 3 | Pyrénées National Park | 🇫🇷 France |
With luck
About 10% of wildlife watchers report a False Grayling sighting in Cévennes National Park on a given day, based on 43 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 225th most-seen of the 996 insects we can rate there. Over three days the chance rises to about 30%, and over a week to about 50%, if each day is a fresh chance.
August
In that month about 30% of wildlife watchers report a False Grayling in Cévennes National Park on a given day, against under 5% in October to June, the lowest months. That is one of Cévennes National Park's driest months, with about 55 mm of rain against 260 mm in October.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most False Grayling 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 3 parks where we can rate False Grayling sightings, Cévennes National Park has the highest daily chance: about 10%. Next come Mercantour National Park (France, about 10%) and Pyrénées National Park (France, under 5%).
Same family: Nymphalidae
The closest relatives of the False Grayling that you can see in Cévennes National Park (family Nymphalidae, Brush-footed Butterflies) are Speckled Wood (about 30%), Silver-Washed Fritillary (about 30%) and Marbled White (about 30%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the False Grayling is recorded against all the insects logged in Cévennes National Park (43 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.
