Peridea anceps
In 3 days ~10% in a week ~20%
Peridea anceps, the great prominent, is a moth of the family Notodontidae first described by Johann August Ephraim Goeze in 1781. It is found in central and southern Europe and North Africa. The wingspan is 50–65 mm. The antennae are almost half as long as the forewing, narrowly feathered in the male and wire-shaped in the female. The body is cylindrical, and covered with dark brownish hairs. The thorax may have slightly different drawings but the middle part is slightly darker and warmer brown than the rest. The forewing is oblong and narrow, almost oval, with a wide "tooth" of backward-pointing hairs approximately in the middle of the back edge. It is yellowish grey with four more or less distinct narrow transverse bands, the two innermost ones being dark and the two outermost light. The hindwing is yellowish-white, darker at the front edge and at the base. The larva is naked without any body outgrowths, green with short, bright oblique stripes on the side of each body joint and some, partially broken, lighter longitudinal stripes along the back. The head capsule is green with four light stripes.
The moth flies from April to July depending on the location. The larvae feed on oak. If the larva is disturbed, it bends the front and hind end upwards until the front body is over the space, and cracks with the legs while shaking the front body. This surprising behavior may be enough to scare predators. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Snowdonia National Park | 🇬🇧 United Kingdom | |
| 2 | Cévennes National Park | 🇫🇷 France | |
| 3 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 4 | Pyrénées National Park | 🇫🇷 France | |
| 5 | Sierra de Guadarrama National Park | 🇪🇸 Spain | |
| 6 | Wadden Sea National Park | 🇩🇪 Germany |
Rare
Under 5% of wildlife watchers report a Great Prominent sighting in Vienna on a given day, based on 7 verified sightings from GBIF citizen-science data. It is the 1090th most-seen of the 1406 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.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Great Prominent in Vienna on a given day, so our monthly data shows no clear season.
Between 9 pm and midnight
Across all the parks we cover, that three-hour window holds the most Great Prominent sightings with a recorded time, and about half of them come between 6 pm and 6 am: it is seen both by day and at night.
Among the best
Of the 3 cities where we can rate Great Prominent sightings, Vienna ranks 3rd at under 5%, level with the leaders once rounded. The best odds are in Hamburg (Germany, under 5%) and Prague (Czechia, under 5%).
GBIF citizen-science records
It is estimated from how often the Great Prominent is recorded against all the insects logged in Vienna (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.
