Coenagrion pulchellum
In 3 days ~20% in a week ~30%
The variable damselfly or variable bluet (Coenagrion pulchellum) is a European damselfly. Despite its name, it is not the only blue damselfly prone to variable patterning. Its behaviour is much like that of the azure damselfly; it usually stays close to vegetation. Immatures are often found in adjacent meadows or uncut grassy areas. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Biebrza National Park | 🇵🇱 Poland | |
| 2 | Kiskunság National Park | 🇭🇺 Hungary | |
| 3 | Białowieża National Park | 🇵🇱 Poland | |
| 4 | Wadden Sea National Park | 🇩🇪 Germany |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Copenhagen | 🇩🇰 Denmark | |
| 2 | Amsterdam | 🇳🇱 Netherlands | |
| 3 | Helsinki | 🇫🇮 Finland | |
| 4 | Moscow | 🇷🇺 Russia | |
| 5 | Vienna | 🇦🇹 Austria | |
| 6 | Rotterdam [The Hague] | 🇳🇱 Netherlands | |
| 7 | Kazan | 🇷🇺 Russia | |
| 8 | Nizhny Novgorod | 🇷🇺 Russia | |
| 9 | Saint Petersburg | 🇷🇺 Russia | |
| 10 | Warsaw | 🇵🇱 Poland |
With luck
About 10% of wildlife watchers report a Variable Bluet sighting in Rotterdam [The Hague] on a given day, based on 12 verified sightings from GBIF citizen-science data. It is the 196th most-seen of the 355 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 a Variable Bluet in Rotterdam [The Hague] on a given day, against under 5% in July to April, the lowest months.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Variable Bluet sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 12 cities where we can rate Variable Bluet sightings, Rotterdam [The Hague] ranks 6th at about 10%, level with the leaders once rounded. The best odds are in Copenhagen (Denmark, about 10%), Amsterdam (Netherlands, about 10%) and Helsinki (Finland, about 10%).
GBIF citizen-science records
It is estimated from how often the Variable Bluet is recorded against all the insects logged in Rotterdam [The Hague] (12 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.
