Cydia amplana
In 3 days ~10% in a week ~20%
Cydia amplana, the rusty oak moth, is a moth of the family Tortricidae. It is found from northern, central and southern Europe to Asia Minor, south-western Russia and Transcaucasus. The wingspan is 16–20 mm. It often needs two years for development. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 2 | Wadden Sea National Park | 🇩🇪 Germany |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | London | 🇬🇧 United Kingdom | |
| 2 | Rotterdam [The Hague] | 🇳🇱 Netherlands | |
| 3 | Porto | 🇵🇹 Portugal |
Rare
Under 5% of wildlife watchers report a Vagrant Piercer sighting in Porto on a given day, based on 8 verified sightings from GBIF citizen-science data. It is the 395th 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.
July and August
In those months about 10% of wildlife watchers report a Vagrant Piercer in Porto on a given day, against under 5% in September to June, the lowest months. Those are among Porto's driest months, with about 20 mm of rain a month against 140 mm in January.
Between 10 pm and 1 am
Across all the parks we cover, that three-hour window holds the most Vagrant Piercer sightings with a recorded time, and about 9 in 10 of them come between 6 pm and 6 am: it is mostly seen at night.
Among the best
Of the 3 cities where we can rate Vagrant Piercer sightings, Porto ranks 3rd at under 5%, level with the leaders once rounded. The best odds are in London (United Kingdom, under 5%) and Rotterdam [The Hague] (Netherlands, under 5%).
GBIF citizen-science records
It is estimated from how often the Vagrant Piercer is recorded against all the insects logged in Porto (8 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.
