Idaea degeneraria
In 3 days ~30% in a week ~60%
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 Sierra Nevada National Park on a given day, based on 14 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 211th most-seen of the 479 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 and September
In those months about 20% of wildlife watchers report a Portland Ribbon Wave in Sierra Nevada National Park on a given day, against under 5% in July and November–March, 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.
Among the best
Of the 4 parks where we can rate Portland Ribbon Wave sightings, Sierra Nevada National Park ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Cévennes National Park (France, about 10%).
Same genus: Idaea
The closest relatives of the Portland Ribbon Wave that you can see in Sierra Nevada National Park (genus Idaea) are Idaea sericeata (about 20%), Least Carpet (about 20%) and Idaea ostrinaria (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 Sierra Nevada National Park (14 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.
