Calopteryx virgo
In 3 days ~20% in a week ~30%
The beautiful demoiselle (Calopteryx virgo) is a species of damselfly belonging to the family Calopterygidae. The species has been found in Europe, North Africa, and Western Asia, and is often found by fast-flowing waters.
Five subspecies have been named, though some authors only accept three subspecies. The subspecies intergrade where their ranges meet. Calopteryx virgo festiva (Brullé, 1832) (eastern Mediterranean, Balkans and Turkey). Wings of males dark throughout.
Calopteryx virgo meridionalis Sélys, 1853 (western Mediterranean and south-west France). Wings of males grading to pale at the base, dark to the tip. Calopteryx virgo padana Conci, 1956 (northern Italy); not accepted by Smallshire et al.
Calopteryx virgo virgo (Linnaeus, 1758) (northern and central Europe). Wings of males grading to pale at both tip and base. Females can lay up to 300 eggs at a time on floating plants, such as water-crowfoot. Similar to the banded demoiselle, they often submerge underwater to do so, and the eggs hatch around 14 days later. The larvae are stick-shaped... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Plitvice Lakes National Park | 🇭🇷 Croatia | |
| 2 | Picos de Europa National Park | 🇪🇸 Spain | |
| 3 | Gauja National Park | 🇱🇻 Latvia | |
| 4 | Cévennes National Park | 🇫🇷 France | |
| 5 | Pyrénées National Park | 🇫🇷 France | |
| 6 | Aigüestortes National Park | 🇪🇸 Spain | |
| 7 | Sierra de Guadarrama National Park | 🇪🇸 Spain | |
| 8 | Triglav National Park | 🇸🇮 Slovenia | |
| 9 | Białowieża National Park | 🇵🇱 Poland | |
| 10 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 11 | Snowdonia National Park | 🇬🇧 United Kingdom |
With luck
About 10% of wildlife watchers report a Beautiful Demoiselle sighting in Vienna on a given day, based on 74 verified sightings from GBIF citizen-science data. It is the 260th most-seen of the 1406 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 to August
In those months about 10% of wildlife watchers report a Beautiful Demoiselle in Vienna on a given day, against under 5% in September to April, the lowest months. Those are among Vienna's wettest months, with about 90 mm of rain a month against 40 mm in February.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Beautiful Demoiselle sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 17 cities where we can rate Beautiful Demoiselle sightings, Vienna ranks 6th at about 10%, level with the leaders once rounded. The best odds are in Munich (Germany, about 10%), Birmingham (United Kingdom, about 10%) and Sofia (Bulgaria, about 10%).
GBIF citizen-science records
It is estimated from how often the Beautiful Demoiselle is recorded against all the insects logged in Vienna (74 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.
