Idaea dimidiata
In 3 days ~20% in a week ~40%
Idaea dimidiata, the single-dotted wave, is a moth of the family Geometridae. It is a Holarctic species. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Wadden Sea National Park | 🇩🇪 Germany | |
| 2 | Gros Morne National Park | 🇨🇦 Canada | |
| 3 | Acadia National Park | 🇺🇸 United States | |
| 4 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 5 | Pyrénées National Park | 🇫🇷 France | |
| 6 | Olympic National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Rotterdam [The Hague] | 🇳🇱 Netherlands | |
| 2 | Liverpool | 🇬🇧 United Kingdom | |
| 3 | London | 🇬🇧 United Kingdom | |
| 4 | Birmingham | 🇬🇧 United Kingdom | |
| 5 | Porto | 🇵🇹 Portugal | |
| 6 | Boston | 🇺🇸 United States | |
| 7 | Leeds | 🇬🇧 United Kingdom | |
| 8 | Dublin | 🇮🇪 Ireland | |
| 9 | Toronto | 🇨🇦 Canada | |
| 10 | Montreal | 🇨🇦 Canada |
With luck
About 10% of wildlife watchers report a Single-Dotted Wave sighting in Porto on a given day, based on 50 verified sightings from GBIF citizen-science data. It is the 131st most-seen of the 498 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.
September
In that month about 20% of wildlife watchers report a Single-Dotted Wave in Porto on a given day, against under 5% in November to April, the lowest months. That is one of Porto's driest months, with about 50 mm of rain against 140 mm in January.
Between 6 and 9 am
Across all the parks we cover, that three-hour window holds the most Single-Dotted Wave sightings with a recorded time, and about 7 in 10 of them come between 6 am and 6 pm: it is most active around dawn and dusk.
Among the best
Of the 27 cities where we can rate Single-Dotted Wave sightings, Porto ranks 5th at about 10%, level with the leaders once rounded. The best odds are in Rotterdam [The Hague] (Netherlands, about 10%), Liverpool (United Kingdom, about 10%) and London (United Kingdom, about 10%).
Same genus: Idaea
The closest relatives of the Single-Dotted 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 Single-Dotted Wave is recorded against all the insects logged in Porto (50 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.
