Idaea dimidiata
In 3 days ~10% in a week ~20%
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 |
Rare
Under 5% of wildlife watchers report a Single-Dotted Wave sighting in Olympic National Park on a given day, based on 6 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 182nd most-seen of the 207 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.
July and August
In those months about 10% of wildlife watchers report a Single-Dotted Wave in Olympic National Park on a given day, against under 5% in September to June, the lowest months. Those are among Olympic National Park's driest months, with about 40 mm of rain a month against 370 mm in November.
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.
6th of 6
Of the 6 parks where we can rate Single-Dotted Wave sightings, Olympic National Park ranks 6th at under 5%. The best odds are in Wadden Sea National Park (Germany, about 10%), Gros Morne National Park (Canada, about 10%) and Acadia National Park (United States, about 10%).
Same family: Geometridae
The closest relatives of the Single-Dotted Wave that you can see in Olympic National Park (family Geometridae, Geometer Moths) are Western White-Ribboned Carpet (about 10%), Gray Spruce Looper Moth (about 10%) and Pale-Marked Angle (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 Olympic National Park (6 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.
