Idaea degeneraria
In 3 days ~40% 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 Porto on a given day, based on 178 verified sightings from GBIF citizen-science data. It is the 42nd most-seen of the 498 insects we can rate there. Over three days the chance rises to about 40%, and over a week to about 60%, if each day is a fresh chance.
August
In that month about 30% of wildlife watchers report a Portland Ribbon Wave in Porto on a given day, against under 5% in October to March, the lowest months. That is one of Porto's driest months, with about 20 mm of rain against 140 mm in January.
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, Porto ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Budapest (Hungary, about 10%).
Same genus: Idaea
The closest relatives of the Portland Ribbon Wave that you can see in Porto (genus Idaea) are Riband Wave (about 20%), Satin Wave (about 20%) and Idaea eugeniata (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 Porto (178 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.
