Perizoma albulata
In 3 days ~30% in a week ~50%
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 Hohe Tauern National Park on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 142nd most-seen of the 165 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.
June
In that month about 20% of wildlife watchers report a Grass Rivulet in Hohe Tauern National Park on a given day, against under 5% in January–May and August–October, the lowest months. December has too few records to rate.
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.
Among the best
Of the 5 parks where we can rate Grass Rivulet sightings, Hohe Tauern National Park ranks 3rd at about 10%, level with the leaders once rounded. The best odds are in Mercantour National Park (France, about 10%) and Vanoise National Park (France, about 10%).
GBIF citizen-science records
It is estimated from how often the Grass Rivulet is recorded against all the insects logged in Hohe Tauern National Park (5 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.
