Lasius brunneus
In 3 days ~20% in a week ~40%
Lasius brunneus is a species of ant in the genus Lasius. The species is widely distributed in Europe, from Sweden in the north to Anatolia in the south. In England this species is almost always found nesting in oak trees or rotting wood mainly foraging in trees but has also been found under stones and foraging on the ground. It is thought to be underrecorded but is fairly common especially in the South East.
Workers are easy to identify as they are bicoloured, but they can be confused with Lasius emarginatus. Nuptial flights have been recorded as early as May on warm days from early morning to early afternoon. Queens are smaller than other Lasius species, mainly a uniform dark brown colour with a flattish, slim appearance. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Pyrénées National Park | 🇫🇷 France |
More parks will be added in future updates.
With luck
About 10% of wildlife watchers report a Brown Tree Ant sighting in Brussels on a given day, based on 17 verified sightings from GBIF citizen-science data. It is the 117th most-seen of the 337 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
February and April–September
In those months about 10% of wildlife watchers report a Brown Tree Ant in Brussels on a given day, against under 5% in March and October–January, the lowest months.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Brown Tree Ant 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 9 cities where we can rate Brown Tree Ant sightings, Brussels ranks 3rd at about 10%, level with the leaders once rounded. The best odds are in Warsaw (Poland, about 10%) and London (United Kingdom, about 10%).
Same genus: Lasius
The closest relatives of the Brown Tree Ant that you can see in Brussels (genus Lasius, Citronella Ants, Fuzzy Ants, and Allies) are Central European Bicolored Ant (about 10%) and Black Garden Ant (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Brown Tree Ant is recorded against all the insects logged in Brussels (17 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.
