Idaea ochrata
In 3 days ~10% in a week ~20%
Idaea ochrata, the bright wave, is a moth of the family Geometridae. It is found in Europe. The species has a wingspan of 21–24 mm. The adults fly at night from late June to early August in one generation [1]. The species overwinters as a larva.
The larvae feed on the flowers of hawk's beard (Crepis sp.), dandelion (Taraxacum) and coltsfoot (Tussaligo) in captivity. In the wild the larvae feed on Smooth Tare and the flowers of Hare's-foot Clover. ^The flight season refers to the British Isles. This may vary in other parts of the range. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sierra Nevada National Park | 🇪🇸 Spain | |
| 2 | Cévennes National Park | 🇫🇷 France | |
| 3 | Sierra de Guadarrama National Park | 🇪🇸 Spain | |
| 4 | Pyrénées National Park | 🇫🇷 France |
Rare
Under 5% of wildlife watchers report a Bright Wave sighting in Porto on a given day, based on 9 verified sightings from GBIF citizen-science data. It is the 357th most-seen of the 498 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 and July
In those months about 10% of wildlife watchers report a Bright Wave in Porto on a given day, against under 5% in August to May, the lowest months. Those are among Porto's driest months, with about 25 mm of rain a month against 140 mm in January.
Between 11 pm and 2 am
Across all the parks we cover, that three-hour window holds the most Bright Wave sightings with a recorded time, and about 7 in 10 of them come between 6 pm and 6 am: it is seen both by day and at night.
5th of 8
Of the 8 cities where we can rate Bright Wave sightings, Porto ranks 5th at under 5%. The best odds are in Kharkiv (Ukraine, about 10%), Prague (Czechia, about 10%) and Madrid (Spain, about 10%).
Same genus: Idaea
The closest relatives of the Bright 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 Bright Wave is recorded against all the insects logged in Porto (9 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.
