Roeseliana roeselii
In 3 days ~10% in a week ~30%
Roesel's bush-cricket (Roeseliana roeselii) (synonym Metrioptera roeselii) is a European bush-cricket, named after August Johann Rösel von Rosenhof, a German entomologist. Adult Roesel's bush-crickets are medium-sized Tettigoniid between 13–26 mm in length. They are normally brown or yellow, often with a greenish shade and a rarer green form also sometimes occurs. An identifying feature is the yellow-green spots along the abdomen, just behind the pronotum, along with a matching margin along the border of the pronotum. This margin is entire, unlike the bog bush-cricket.
Males and females can be easily differentiated, as the females have a long sword-like ovipositor at the end of their abdomen, which the males lack. Both male and female adults are normally brachypterous. However, a macropterous form, f. diluta (described by Charpentier 1825) also exists. These have much longer wings, and usually make up less than 1% of the total population, but in some populations occur in much higher numbers, usually in areas where the bush-cricket's range has recently expanded to.
They are more common in long, warm summers where populations... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Tatra National Park | 🇸🇰 Slovakia | |
| 2 | Mercantour National Park | 🇫🇷 France | |
| 3 | Elk Island National Park | 🇨🇦 Canada | |
| 4 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 5 | Aigüestortes National Park | 🇪🇸 Spain | |
| 6 | Triglav National Park | 🇸🇮 Slovenia | |
| 7 | Białowieża National Park | 🇵🇱 Poland | |
| 8 | Pyrénées National Park | 🇫🇷 France | |
| 9 | Fertő-Hanság National Park | 🇭🇺 Hungary | |
| 10 | Wadden Sea National Park | 🇩🇪 Germany | |
| 11 | Acadia National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Birmingham | 🇬🇧 United Kingdom | |
| 2 | London | 🇬🇧 United Kingdom | |
| 3 | Warsaw | 🇵🇱 Poland | |
| 4 | Helsinki | 🇫🇮 Finland | |
| 5 | Manchester | 🇬🇧 United Kingdom | |
| 6 | Kharkiv | 🇺🇦 Ukraine | |
| 7 | Hamburg | 🇩🇪 Germany | |
| 8 | Berlin | 🇩🇪 Germany | |
| 9 | Minneapolis [Saint Paul] | 🇺🇸 United States | |
| 10 | Liverpool | 🇬🇧 United Kingdom |
Rare
Under 5% of wildlife watchers report a Roesel's Bush-Cricket sighting in Brussels on a given day, based on 6 verified sightings from GBIF citizen-science data. It is the 260th most-seen of the 337 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
June–July and September
In those months about 10% of wildlife watchers report a Roesel's Bush-Cricket in Brussels on a given day, against under 5% in August and October–May, the lowest months.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Roesel's Bush-Cricket sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
19th of 28
Of the 28 cities where we can rate Roesel's Bush-Cricket sightings, Brussels ranks 19th at under 5%. The best odds are in Birmingham (United Kingdom, about 20%), London (United Kingdom, about 10%) and Warsaw (Poland, about 10%).
Same family: Tettigoniidae
The closest relatives of the Roesel's Bush-Cricket that you can see in Brussels (family Tettigoniidae, Katydids) are Great Green Bush-Cricket (about 10%), Dark Bush-Cricket (about 10%) and Speckled Bush-Cricket (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Roesel's Bush-Cricket is recorded against all the insects logged in Brussels (6 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.
