Triodia sylvina
In 3 days ~30% in a week ~60%
The orange swift or orange moth (Triodia sylvina) is a moth belonging to the family Hepialidae. The species was first described by Carl Linnaeus in 1761 and was previously placed in the genus Hepialus. It is distributed throughout Europe.
This species has a wingspan of 32–48 mm. The male has rich orange forewings with two white bars forming a "V" shape. The hindwings are dark brown. The female is similar but generally larger and less brightly coloured. It flies at night from June to September[1] and is attracted to light. They do not have a proboscis so will not be found at flowers feeding. The globular, shiny black eggs are broadcast by the female as she hovers over the food plant.
Larva When they hatch the larvae find their foodplant, bore into the root and are 25 to 30 mm long when fully fed. They have an orange-brown head and a shiny white body with brownish-orange dorsal plates on the thoracic segments; spiracles are black. They can feed for two years from September to July on the roots of various plants including bracken (Pteridium species), dandelion (Taraxacum species), docks (Rumex species), hop (Humulus lupulus) and viper's bugloss (Echium vulgare).
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| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 2 | Fertő-Hanság National Park | 🇭🇺 Hungary | |
| 3 | Cévennes National Park | 🇫🇷 France | |
| 4 | Pyrénées National Park | 🇫🇷 France | |
| 5 | Wadden Sea National Park | 🇩🇪 Germany | |
| 6 | Sierra de Guadarrama National Park | 🇪🇸 Spain |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Lyon | 🇫🇷 France | |
| 2 | Prague | 🇨🇿 Czechia | |
| 3 | Birmingham | 🇬🇧 United Kingdom | |
| 4 | Copenhagen | 🇩🇰 Denmark | |
| 5 | Vienna | 🇦🇹 Austria | |
| 6 | Hamburg | 🇩🇪 Germany | |
| 7 | Rotterdam [The Hague] | 🇳🇱 Netherlands | |
| 8 | Paris | 🇫🇷 France | |
| 9 | Cologne | 🇩🇪 Germany | |
| 10 | Milan | 🇮🇹 Italy |
With luck
About 10% of wildlife watchers report an Orange Swift sighting in Prague on a given day, based on 140 verified sightings from GBIF citizen-science data. It is the 36th most-seen of the 724 insects we can rate there. Over three days the chance rises to about 30%, and over a week to about 60%, if each day is a fresh chance.
August
In that month about 40% of wildlife watchers report an Orange Swift in Prague on a given day, against under 5% in October to July, the lowest months. That is one of Prague's wettest months, with about 80 mm of rain against 30 mm in February.
Between 9 pm and midnight
Across all the parks we cover, that three-hour window holds the most Orange Swift sightings with a recorded time, and about 6 in 10 of them come between 6 pm and 6 am: it is seen both by day and at night.
Among the best
Of the 27 cities where we can rate Orange Swift sightings, Prague ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Lyon (France, about 10%).
GBIF citizen-science records
It is estimated from how often the Orange Swift is recorded against all the insects logged in Prague (140 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.
