Perizoma albulata
In 3 days ~30% in a week ~60%
Perizoma albulata, the grass rivulet, is a moth of the genus Perizoma in the family Geometridae. The species was first described by Michael Denis and Ignaz Schiffermüller in 1775. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Mercantour National Park | 🇫🇷 France | |
| 2 | Vanoise National Park | 🇫🇷 France | |
| 3 | Hohe Tauern National Park | 🇦🇹 Austria | |
| 4 | Pyrénées National Park | 🇫🇷 France | |
| 5 | Wadden Sea National Park | 🇩🇪 Germany |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Birmingham | 🇬🇧 United Kingdom | |
| 2 | London | 🇬🇧 United Kingdom |
With luck
About 10% of wildlife watchers report a Grass Rivulet sighting in Mercantour National Park on a given day, based on 11 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 221st most-seen of the 412 insects we can rate there. Over three days the chance rises to about 30%, and over a week to about 60%, if each day is a fresh chance.
June
In that month about 20% of wildlife watchers report a Grass Rivulet in Mercantour National Park on a given day, against under 5% in September to May, the lowest months.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Grass Rivulet sightings with a recorded time, and about half of them come between 6 am and 6 pm: it is seen both by day and at night.
Yes
Of the 5 parks where we can rate Grass Rivulet sightings, Mercantour National Park has the highest daily chance: about 10%. Next come Vanoise National Park (France, about 10%) and Hohe Tauern National Park (Austria, about 10%).
Same family: Geometridae
The closest relatives of the Grass Rivulet that you can see in Mercantour National Park (family Geometridae, Geometer Moths) are Common Heath (about 20%), Silver-Ground Carpet (about 20%) and Tissue (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Grass Rivulet is recorded against all the insects logged in Mercantour National Park (11 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.
