Libellula fulva
In 3 days ~20% in a week ~40%
The scarce chaser (Libellula fulva) is a species of dragonfly. The adult male has a bright blue abdomen with patches of black, while the adult female and juvenile male each have a bright orange abdomen. It is about 45 mm in length with an average wingspan of 74 mm. It is distributed throughout Europe. This dragonfly is considered a species of special concern in Great Britain due to loss of its specific ideal habitat.
This species lives on floodplains and marshes with dense, abundant vegetation, and females deposit their eggs in slow-current streams. Once deposited by the female, the eggs lie embedded in the mud of the riverbed and the larvae develop underwater for usually two years. Adults live from May to August, during which time they mate and lay eggs.
"Scarce Chaser". British Dragonfly Society. Retrieved 29 September 2011. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Plitvice Lakes National Park | 🇭🇷 Croatia | |
| 2 | Biebrza National Park | 🇵🇱 Poland | |
| 3 | Białowieża National Park | 🇵🇱 Poland | |
| 4 | Fertő-Hanság National Park | 🇭🇺 Hungary |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Brussels | 🇧🇪 Belgium | |
| 2 | Kharkiv | 🇺🇦 Ukraine | |
| 3 | Rostov-on-Don | 🇷🇺 Russia | |
| 4 | Paris | 🇫🇷 France | |
| 5 | Kyiv | 🇺🇦 Ukraine | |
| 6 | Vienna | 🇦🇹 Austria | |
| 7 | Milan | 🇮🇹 Italy | |
| 8 | Budapest | 🇭🇺 Hungary | |
| 9 | Berlin | 🇩🇪 Germany | |
| 10 | Nizhny Novgorod | 🇷🇺 Russia |
With luck
About 10% of wildlife watchers report a Scarce Chaser sighting in Vienna on a given day, based on 101 verified sightings from GBIF citizen-science data. It is the 193rd 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 40%, if each day is a fresh chance.
May to July
In those months about 10% of wildlife watchers report a Scarce Chaser in Vienna on a given day, against under 5% in August 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 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Scarce Chaser sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
6th of 13
Of the 13 cities where we can rate Scarce Chaser sightings, Vienna ranks 6th at about 10%. The best odds are in Brussels (Belgium, about 20%), Kharkiv (Ukraine, about 10%) and Rostov-on-Don (Russia, about 10%).
GBIF citizen-science records
It is estimated from how often the Scarce Chaser is recorded against all the insects logged in Vienna (101 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.
