Tephritis bardanae
In 3 days ~10% in a week ~30%
Tephritis bardanae is a picture-winged fly of the family Tephritidae, which are variously known as fruit-flies (North America) or gall flies (Britain and Ireland). The larvae feed in the flower-heads (capitula) of species of Arctium (burdocks), causing galls to form.
The larvae pupates in autumn, forming a black puparium. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Helsinki | 🇫🇮 Finland | |
| 2 | Stockholm | 🇸🇪 Sweden | |
| 3 | Brussels | 🇧🇪 Belgium | |
| 4 | Rotterdam [The Hague] | 🇳🇱 Netherlands | |
| 5 | Kazan | 🇷🇺 Russia | |
| 6 | Yekaterinburg | 🇷🇺 Russia | |
| 7 | London | 🇬🇧 United Kingdom | |
| 8 | Saint Petersburg | 🇷🇺 Russia | |
| 9 | Moscow | 🇷🇺 Russia |
Rare
Under 5% of wildlife watchers report a Burdock Fly sighting in Rotterdam [The Hague] on a given day, based on 6 verified sightings from GBIF citizen-science data. It is the 301st most-seen of the 355 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 September
In those months about 10% of wildlife watchers report a Burdock Fly in Rotterdam [The Hague] on a given day, against under 5% in July–August and October–May, the lowest months.
4th of 9
Of the 9 cities where we can rate Burdock Fly sightings, Rotterdam [The Hague] ranks 4th at under 5%. The best odds are in Helsinki (Finland, about 10%), Stockholm (Sweden, about 10%) and Brussels (Belgium, about 10%).
GBIF citizen-science records
It is estimated from how often the Burdock Fly is recorded against all the insects logged in Rotterdam [The Hague] (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.
