Perizoma albulata
In 3 days ~10% in a week ~20%
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 |
Rare
Under 5% of wildlife watchers report a Grass Rivulet sighting in Wadden Sea National Park on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 699th most-seen of the 818 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
June
In that month about 10% of wildlife watchers report a Grass Rivulet in Wadden Sea National Park on a given day, against under 5% in July 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.
5th of 5
Of the 5 parks where we can rate Grass Rivulet sightings, Wadden Sea National Park ranks 5th at under 5%. The best odds are in Mercantour National Park (France, about 10%), Vanoise National Park (France, about 10%) and Hohe Tauern National Park (Austria, about 10%).
GBIF citizen-science records
It is estimated from how often the Grass Rivulet is recorded against all the insects logged in Wadden Sea 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.
