Idaea degeneraria
In 3 days ~40% in a week ~70%
Idaea degeneraria, the Portland ribbon wave, is a moth of the family Geometridae. The species was first described by Jacob Hübner in 1799. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cévennes National Park | 🇫🇷 France | |
| 2 | Sierra Nevada National Park | 🇪🇸 Spain | |
| 3 | Sierra de Guadarrama National Park | 🇪🇸 Spain | |
| 4 | Pyrénées National Park | 🇫🇷 France |
With luck
About 10% of wildlife watchers report a Portland Ribbon Wave sighting in Cévennes National Park on a given day, based on 111 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 113th most-seen of the 996 insects we can rate there. Over three days the chance rises to about 40%, and over a week to about 70%, if each day is a fresh chance.
May
In that month about 30% of wildlife watchers report a Portland Ribbon Wave in Cévennes National Park on a given day, against under 5% in July and November–April, the lowest months.
Between 10 pm and 1 am
Across all the parks we cover, that three-hour window holds the most Portland Ribbon Wave 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 4 parks where we can rate Portland Ribbon Wave sightings, Cévennes National Park has the highest daily chance: about 10%. Next come Sierra Nevada National Park (Spain, about 10%) and Sierra de Guadarrama National Park (Spain, about 10%).
Same genus: Idaea
The closest relatives of the Portland Ribbon Wave that you can see in Cévennes National Park (genus Idaea) are Satin Wave (about 10%), Idaea ostrinaria (about 10%) and Least Carpet (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Portland Ribbon Wave is recorded against all the insects logged in Cévennes National Park (111 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.
