Udea olivalis
In 3 days ~20% in a week ~30%
Udea olivalis is a species of moth of the family Crambidae. It was first described by Michael Denis and Ignaz Schiffermüller in 1775 and is found in Europe. The wingspan is 24–28 mm. The forewings are greyish ochreous or brownish, densely sprinkled with dark fuscous lines hardly darker, indistinct, second serrate, often posteriorly whitish -edged, preceded in middle by a white spot, curved, with abrupt deep sinuation inwards below middle; large orbicular and reniform discal spot darker, separated by a subquadrate white spot; posterior half of costa whitish, dotted with dark fuscous. Hindwings white, dorsal half light grey; two dark grey discal dots; a fuscous terminal fascia. The larva is light green; dorsal line dark green; spots large, black; head and plate of 2 black-freckled
The moth flies from May to August depending on the location. The larvae feed on various herbaceous plants, such as Hedera helix, Lychnis, Urtica, Symphytum officinale and Lamiaceae. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Wadden Sea National Park | 🇩🇪 Germany |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Amsterdam | 🇳🇱 Netherlands | |
| 2 | London | 🇬🇧 United Kingdom | |
| 3 | Birmingham | 🇬🇧 United Kingdom |
With luck
About 10% of wildlife watchers report an Olive Pearl sighting in Amsterdam on a given day, based on 7 verified sightings from GBIF citizen-science data. It is the 151st most-seen of the 234 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 30%, if each day is a fresh chance.
May and June
In those months about 10% of wildlife watchers report an Olive Pearl in Amsterdam on a given day, against under 5% in July to April, the lowest months.
Between 10 pm and 1 am
Across all the parks we cover, that three-hour window holds the most Olive Pearl 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.
Yes
Of the 3 cities where we can rate Olive Pearl sightings, Amsterdam has the highest daily chance: about 10%. Next come London (United Kingdom, under 5%) and Birmingham (United Kingdom, under 5%).
GBIF citizen-science records
It is estimated from how often the Olive Pearl is recorded against all the insects logged in Amsterdam (7 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.
