Serica brunnea
In 3 days ~10% in a week ~30%
Serica brunnea, the brown chafer, is a species of beetle of the family Scarabaeidae. It is found in Albania, Austria, Belarus, Belgium, Bosnia Herzegovina, Bulgaria, China (Xinjiang), Croatia, the Czech Republic, Denmark, Finland, France, Germany, Great Britain, Hungary, Ireland, Italy, Kazakhstan, Latvia, Lichtenstein, Lithuania, Luxembourg, North Macedonia, Moldova, Mongolia, the Netherlands, Norway, Poland, Romania, Russia, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland and Ukraine. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Vanoise National Park | 🇫🇷 France | |
| 2 | Wadden Sea National Park | 🇩🇪 Germany | |
| 3 | Cairngorms National Park | 🇬🇧 United Kingdom | |
| 4 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 5 | Pyrénées National Park | 🇫🇷 France |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Helsinki | 🇫🇮 Finland | |
| 2 | Hamburg | 🇩🇪 Germany | |
| 3 | Rotterdam [The Hague] | 🇳🇱 Netherlands | |
| 4 | Essen | 🇩🇪 Germany | |
| 5 | Copenhagen | 🇩🇰 Denmark | |
| 6 | Berlin | 🇩🇪 Germany | |
| 7 | Amsterdam | 🇳🇱 Netherlands | |
| 8 | Warsaw | 🇵🇱 Poland | |
| 9 | Minsk | 🇧🇾 Belarus | |
| 10 | Stockholm | 🇸🇪 Sweden |
Rare
Under 5% of wildlife watchers report a Brown Chafer sighting in Brussels on a given day, based on 7 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 and July
In those months about 10% of wildlife watchers report a Brown Chafer in Brussels on a given day, against under 5% in August to May, the lowest months.
Between 10 pm and 1 am
Across all the parks we cover, that three-hour window holds the most Brown Chafer sightings with a recorded time, and about 7 in 10 of them come between 6 pm and 6 am: it is mostly seen at night.
12th of 15
Of the 15 cities where we can rate Brown Chafer sightings, Brussels ranks 12th at under 5%. The best odds are in Helsinki (Finland, about 10%), Hamburg (Germany, about 10%) and Rotterdam [The Hague] (Netherlands, about 10%).
Same family: Scarabaeidae
The closest relatives of the Brown Chafer that you can see in Brussels (family Scarabaeidae, Scarabs) are Valgus hemipterus (about 10%), Common Cockchafer (about 10%) and Summer Chafer (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Brown Chafer is recorded against all the insects logged in Brussels (7 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.
