Hydrometra stagnorum
In 3 days ~10% in a week ~20%
Hydrometra stagnorum, the common water-measurer, is a species of aquatic bugs in the family Hydrometridae, the water measurers. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cévennes National Park | 🇫🇷 France | |
| 2 | Sierra Nevada National Park | 🇪🇸 Spain | |
| 3 | Pyrénées National Park | 🇫🇷 France | |
| 4 | Wadden Sea National Park | 🇩🇪 Germany |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Paris | 🇫🇷 France | |
| 2 | Porto | 🇵🇹 Portugal | |
| 3 | Berlin | 🇩🇪 Germany | |
| 4 | Hamburg | 🇩🇪 Germany | |
| 5 | Munich | 🇩🇪 Germany | |
| 6 | London | 🇬🇧 United Kingdom | |
| 7 | Essen | 🇩🇪 Germany | |
| 8 | Birmingham | 🇬🇧 United Kingdom | |
| 9 | Warsaw | 🇵🇱 Poland | |
| 10 | Copenhagen | 🇩🇰 Denmark |
Rare
Under 5% of wildlife watchers report a Common Water Measurer sighting in Warsaw on a given day, based on 5 verified sightings from GBIF citizen-science data. It is the 501st most-seen of the 580 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.
September
In that month about 10% of wildlife watchers report a Common Water Measurer in Warsaw on a given day, against under 5% in October to August, the lowest months.
Between 2 and 5 pm
Across all the parks we cover, that three-hour window holds the most Common Water Measurer sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
9th of 12
Of the 12 cities where we can rate Common Water Measurer sightings, Warsaw ranks 9th at under 5%. The best odds are in Paris (France, about 10%), Porto (Portugal, under 5%) and Berlin (Germany, under 5%).
Same order: Hemiptera
The closest relatives of the Common Water Measurer that you can see in Warsaw (order Hemiptera, True Bugs, Hoppers, Aphids, and allies) are European Firebug (about 30%), Green Shield Bug (about 20%) and European Striped Shield Bug (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Common Water Measurer is recorded against all the insects logged in Warsaw (5 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.
