Idaea degeneraria
In 3 days ~20% in a week ~40%
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 Vienna on a given day, based on 78 verified sightings from GBIF citizen-science data. It is the 219th most-seen of the 1406 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
May–June and August–September
In those months about 10% of wildlife watchers report a Portland Ribbon Wave in Vienna on a given day, against under 5% in July and October–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.
Among the best
Of the 14 cities where we can rate Portland Ribbon Wave sightings, Vienna ranks 10th at about 10%, level with the leaders once rounded. The best odds are in Budapest (Hungary, about 10%), Porto (Portugal, about 10%) and Sofia (Bulgaria, about 10%).
Same genus: Idaea
The closest relatives of the Portland Ribbon Wave that you can see in Vienna (genus Idaea) are Small Dusty Wave (about 10%), Least Carpet (about 10%) and Riband Wave (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 Vienna (78 verified sightings), 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.
